Electric Vehicles

Electric car questions? Ask an electric car mechanic online.

Ask an Expert,
Get an Answer ASAP!

Electric Vehicles Marathon: I own a 1985 ezgo marathon,

Customer Question
Hi I own a 1985 ezgo...
Hi
I own a 1985 ezgo marathon, the b atteries are new a year ago and fully charged. Two weeks ago the cart would not stop driving when you took your foot off of the accelerator. the speed was like the wiper arm was on the first contact button but the carbon button on the wiper arm is diffenatly resting on the idle button. I have the service manual for this model and for all the good it did for me I tested the system with a fluke 83III meter. The power seemed to be every where that it should be. With the rear end raised for testing we found that the motor speed was not consistant, sometimes the top speed was fully there and other times it wasn't full. This machine was given to me a few years ago so I don't know how much use was put onto it but other needing batteries it ran fine. I'm retired and handycaped and just use it for basic trans around by property. I decided that maybe the problem might be in the accelkerator panel and the wiper arm. I ordered and installed and new panel, wiper arm, tall solenoid and micro switch. No change, it still wants to drive in nuetral but now I get a high energy arc when the wiper hits the first driive button but seems to run fine on the other three buttons. None of the golf cart shops arouund me want to work on this old of a machine. Can you shed some light.
Submitted: 3 years ago.Category: Electric Vehicles
Show More
Show Less
Ask Your Own Electric Vehicles Question
Answered in 45 minutes by:
6/5/2015
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
Curtis B.
Curtis B., Other
Category: Electric Vehicles
Satisfied Customers: 31,098
Experience: Worked on fleet of various electric vehicles, golf carts, scissor lifts and electric booms.
Verified
Check the resistor pack, there are three resistor coils in the box. If resistor is melted to one of the other coils ,can cause speed problem. As for the driving neutral, I would replace the solenoid as it has to make and break the circuit. Sounds like it is sticking. I had one of this same model and had it all over my shop in pieces!
Ask Your Own Electric Vehicles Question
Customer reply replied 3 years ago
Thank you for the response. My resistor is not in a box, however, I have not checked the coils to see if they are shorted. That will be my next step. However, keep in mind I installed a new solenoid on the accelerator panel and before installing the solenoid with my tester we checked it to make sure it was working correctly. When I ordered the solenoid there was two choices, a short one and a tall one. All I had to go by was visual and looking at the old solenoid it definitely was taller than a conventional solenoid so I ordered the tall one. This new solenoid matched up perfectly to the old one. I will let you know what the outcome is on the resistor coil. Thanks, again.
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
!!I missed you changing the solenoid. The shorter/longer one would make no difference. But are you sure it is not staying closed from outside voltage source ? I assume you have a wiring diagram for the unit. Here is a link to one.-------------------------------------------------------------------------------------------------------------------------------------------------------------------------http://www.vintagegolfcartparts.com/gallery/categories/EZGO/EZ_Go_Wiring_Diagrams/media/ez-go2.jpg
Ask Your Own Electric Vehicles Question
Customer reply replied 3 years ago
My testing procedure on the solenoid was by activating the system with the key switch and with the forward/reverse lever in forward position, the micro switch closed the small wire which activated the solenoid which gives a closed circuit for the two heavy battery wires. I have to admit I'm a bit confused because there is a position which shows 36 volts on both sides of the solenoid. The wiring diagram and e-z go service manual does not really make it clear as to what happens when certain switches are turned on and off. My background for the past 45 years has been a repair mechanic on John Deere powered equipment. Just recently sold my business after 43 years. My training through John Deere has kind of spoiled me because for every system that John Deere uses regardless if it's electrical, hydraulic, etc. we never proceeded to repair a system unless we knew how the system operated, i.e. go to JD's Theory of Operation section. Theory of Operation would give us a flow chart and would explain to us exactly what happens if and when switches or turned off and on, which made it very easy for us to isolate complex problems. I really do not understand fully how this system works in these carts. For instance, all of the equipment I'm used to working on, the frame of the machine is connected through a ground system whereas the carts do not have a grounded frame. Sure would love to have a detailed theory of operation for this machine to understand how this electricity flows. Tomorrow I will be testing the resistor to see if possibly that is my problem, because I am baffled as to why this cart will travel low speed without the accelerator pedal being applied. Thanks again.
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
I took all of the f/r micro switches out of mine and only left one on the foot pedal , to close the solenoid. Much to confusing for me on all the micro switch wiring. I was old diesel tech, and simple was always better.
Ask Your Own Electric Vehicles Question
Customer reply replied 3 years ago
Good morning CurtisI feel lucky that I hooked up with an "Old School Tech" with real life "Seat Time". Too often I'm confronted with young techs that are wizzes in new computer electronics but have no idea what to do with real carburetors or battery ignition with points and condenser. I like you have always peached "keep it simple". I also get real frustrated when I'm trying to repair something I don't understand, at that point for me it becomes a matter of principle. I'm pretty good with electrical repairs so long as I have a good tech manual with a good diagram. I'm not sure if I mentioned this or not but I have a handicap, I'm loosing the control of muscles in my arms and legs so turning wrenches won't happen. Along with help of long time friends I manage to keep up with problems like this one so as soon as these guys show up this morning I will dig deeper into this machine. I can't tell you how much I miss this machine, it's my means of getting around my property. I will keep you updated
thanks, Louie
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
Thanks Louie for the response, I have some honey do's today, so I will be out of contact during the middle of the day.
Ask Your Own Electric Vehicles Question
Customer reply replied 3 years ago
Morning Curtis
Here is an update from them weekend. My son who is a service manager for a large John Deere dealership worked on testing the electrical system on this cart from 10:00 am to 5:00 pm yesterday. The control and power systems were tested at least twice following the steps in the ezgo service manual. We first visually checked out the resistor coils looking for any signs of over heating or damage, none where found. All switches and electrical paths were spot on, batteries up to full charge with static voltage at just over 38 volts dc. I mentioned before about the high energy arc between the park terminal and the #one terminal on the accelerator panel. This arc is jumping from the #1 terminal back to the wiper arm brush when the arm is parked on the park terminal and the wiper arm brush is not touching the #1 at all. This arc has actually burned a gouge in the insulated board between those two terminals and badly pitted both terminals and the end of the wiper arm brush. Keep in mind the accelerator panel, terminals and wiper arm brush were all new. I replaced the old accelerator panel and wiper arm just because, they really weren't worn out. So now we clean up the old accelerator panel, hand file the new wiper arm brush flat and smooth again and installed them. With the rear end of the cart up on jack stands we started testing the drive system. Everything ran perfectly, all four speed range changes were noticed which told us the resistor was working correctly. There was no arcing at all. We continued testing for about 15 minutes trying all possible accelerator variations. Now we decide to test it on the ground. We slowly pushed the wiper arm to the #1 terminal and immediately there was the high energy arc. Even when we let up on the accelerator pedal the arc continues to jump across to the wiper arm brush which is now sitting solely on the park terminal. By shifting the F/R lever to neutral it kills the arc.. Further testing results, We found that if you slowly advance the accelerator to the number 1 terminal and immediately let off, a high energy arc continues to jump from the number 1 terminal to the wiper arm brush on the park terminal. If we then take and snap the accelerator quickly it will kill this arc. We also find now if we advance the accelerator rapidly all the way to the number 4 terminal, everything seems to work perfectly, with very minor arcing as the wiper arm brush touches each terminal. If we do not linger on the number 1 terminal at all, you would never know there is a problem. The motor seems to run extremely strong. On the gravel driveway the wheels will spin gravel all over the place. At my wits end! Don't know what to do next. Please advise!
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
Did you run a motor test and test it for grounds? I'm not sure you don't have a motor that has internal winding problem. Another thought I just had, was on the later model Ezgo's they put a resistor on the solenoid just to keep it from having voltage spikes. I don't see one on this diagram, but it could be added. Ezgo part # ***** Look at the solenoid test , talks about the resistor?
Ask Your Own Electric Vehicles Question
Customer reply replied 3 years ago
Hi Curtis,
I'm not sure if we are both on the same Service Manual. My manual is 19968-G1 Issued 8/1/85. I'm not finding anything about a resistor on the solenoid. Furthermore, I need help understanding where a resistor would be wired in and how does it work and what does it do?
I am having a terrible time understanding where this voltage is coming from for the high energy arc. Is this voltage actually jumping from the wiper arm brush forward to the number 1 terminal on accelerator plate? If so, there must be something that keeps the voltage flowing, but what?
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
Here is site that has the solenoid test for the newer carts. It mentions the resistor. It has to be on the newer carts. Scroll down the opening page and find the tests. I'm not well versed on electrical problems, I just always figure it's something simple and not high tech. That's what I liked about my old Ezgo with the resistor pack! -------------------------------------------------------------------------------------------------------------------------------http://mrcarts.com/cat_ezgo_technical_info.cfm
Ask Your Own Electric Vehicles Question
Customer reply replied 3 years ago
Curtis,
Thanks for your help, but at this point I looked at the site you recommended but my cart does not have electronic speed sensors in it. Nothing that I'm reading there indicates it can help my problem. I need to move on and try to find someone who can help me solve this problem one way or the other.
Lou
Electric Vehicle Mechanic: Curtis B., Other replied 3 years ago
Motor test is the same, have you ran the motor ground test?
Ask Your Own Electric Vehicles Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an electric vehicle mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Curtis B. Your Own Question
Curtis B.
Curtis B.
Curtis B., Other
Category: Electric Vehicles
Satisfied Customers: 31,098
31,098 Satisfied Customers
Experience: Worked on fleet of various electric vehicles, golf carts, scissor lifts and electric booms.

Curtis B. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Other

31,098 satisfied customers

Worked on fleet of various electric vehicles, golf carts, scissor lifts and electric booms.

Dr. Hamman

Dr. Hamman

ASE Certified Technician

23 satisfied customers

I am ASE certified and have 35+ years experience, with an engineering background. I also specialize in electronics.

CC-Tech

CC-Tech

Technician

18 satisfied customers

25 years experience in the field of troubleshooting and repair of golf cars; both gasoline and electric powered.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

1,330 satisfied customers

16 years of experience

Ted G.

Ted G.

ASE Certified Technician

1,754 satisfied customers

20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

George H.

George H.

ASE Certified Technician

1,560 satisfied customers

ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

GM Tech (Cam)

GM Tech (Cam)

Auto Service Tech

678 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

< Previous | Next >

Related Electric Vehicles Questions
A year ago drained the old differential fluid from my 2007
A year ago drained the old differential fluid from my 2007 electric golf cart because of a grinding noise it fix the problem for a while now the same noise is back … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
Wire dirgram for battery change 4 12 v. New batterys need to
yes new batterys need to hook them up + TO + or +to - have 4 batterys 24 v club cart … read more
George H.
George H.
ASE Certified Technician
Associate Degree
1,560 satisfied customers
Working on a 2006 Nissan Frontier Truck 2WD 2.5l. The a/c is
Working on a 2006 Nissan Frontier Truck 2WD 2.5l. The a/c is not blowing cold. I have recovered the freon and replaced it back, was just a touch low, not enough to cause the compressor to not come on.… read more
Mechanic01
Mechanic01
2,813 satisfied customers
I have a Gem car with a Zivan charger that will not charge.
I have a Gem car with a Zivan charger that will not charge. Just stopped charging. I adjusted emergency brake and when I plugged in Car it would not activate … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
If have a 48 volt ezgo golf cart. having trouble charging, I
if have a 48 volt ezgo golf cart. having trouble charging, I have checked the batteries and the charger, all is good would like to know what else to check … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
When i hook to my 36volt charger it jumps too 30 amps and
when i hook to my 36volt charger it jumps too 30 amps and then shuts down,power is going into but none going too batters … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
Ihave put new batteries in my cart,and the indicator shows a
Ihave put new batteries in my cart,and the indicator shows a low level of power left after only a few holes. Iam wondering if the 3 nlight indicator is on the blink. Can you help? … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
Batytery charger wil;l not charge the batteries. Leaking? It
So far I have neutralized the corrosion at the terminals and am prepared to begin to charge each battery separately. … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
When my batteries go down to low my charger will not charge
When my batteries go down to low my charger will not charge them.I have to take it to the dealership to get them charged.… read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
Have 2004 precedent with 4 12 batteries. Replaced all.
HI...have 2004 precedent with 4 12 batteries. Replaced all. changed solenoid. Still nothing. Can't find where the fuses are? Original problem started with a sparking rear compartment when daughter was… read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
I just changed out all my cables and my cart will not move I
I just changed out all my cables and my cart will not move I get for green lights on the controller all connections are tight and in the right place … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
How often should you check battery fluid? No it is just
no it is just getting slower, sooner and does not stay fully charge as long as it did. … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
Curtis can you use marine deep cell batteries in a 48 volte
Curtis can you use marine deep cell batteries in a 48 volte golf cart instead of golf cart deep cell if so what do you reccremend… read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
I have A gasoline Club car serial number AG9828-673924. 1998
I have A gasoline Club car serial number AG9828-673924 … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
Currently using a Polaris GEM with a Zivan 48V-60A power
Currently using a Polaris GEM with a Zivan 48V-60A power charger unit. When plugged in to charge the wall unit indicates it's charging but the Zivan unit does not turn on to charge the vehicle. Any in… read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
I have a oil leak .it is a club car. It looks like it is
i have a oil leak .it is a club car . It looks like it is coming from around the … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
I have a 2002 48 volt club car when I put new batteries in
i have a 2002 48 volt club car when I put new batteries in it it will run fine for while then I I go for a nite ride … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
I have EZ-go 36 volt electric cart. It will not move in
I have EZ-go 36 volt electric cart. It will not move in either direction, when you press the pedal you can hear solenoid click. I checked voltage at 37 volts. … read more
Curtis B.
Curtis B.
Other
31,098 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x