RV

Have RV Questions? Ask an RV Mechanic Online.

Ask an Expert,
Get an Answer ASAP!

RV

I have a strange problem where when I leave my house, my RV

Customer Question
batteries are fully charged, but...
I have a strange problem where when I leave my house, my RV batteries are fully charged, but when I arrive after even two hours driving, the coach batteries are all the way drained. I do not have a DC fridge, and nothing is running in the coach. My alternator is working because the engine runs fine, and my batteries recharge from the engine when I am parked if I run the engine. The batteries hold up fine when I am at camp - they only deplete when I am driving. I have load tested the batteries and they are great. They are only two years old.
Submitted: 2 months ago.Category: RV
Show More
Show Less
Ask Your Own RV Question
Answered in 2 hours by:
9/14/2017
RV Mechanic: Robert, RV Mechanic replied 2 months ago
Robert
Robert, RV Mechanic
Category: RV
Satisfied Customers: 13,578
Experience: 18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
Verified

Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.

Ask Your Own RV Question
RV Mechanic: Robert, RV Mechanic replied 2 months ago

So you are saying ONLY when driving the house battery will run down and you are saying that when you run the engine parked the house batteries charge back up???

Thanks, Robert

Ask Your Own RV Question
Customer reply replied 2 months ago
Hi Robert - Yes, the batteries work just fine when I am dry camped, using my generator, etc. Same when plugged into shore power at home. Everything works fine and just as it should, except that when I drive to a camping spot, I am always drained according to the four red light meter on the control panel. I believe this to be accurate because my fridge will be flashing a message telling me "Low DC Voltage" as well. It is not a DC fridge, its just telling me that the fridge controls will start freaking out I think. The batteries are all linked together (four class 29 Interstate Deep Cycle RV Batts). I have disconnected each battery individually and load tested them in isolation and they are all perfect - only two years old. I believe the alternator to be OK because if I watch the four red light meter and start the truck, it starts to bring them back up. When I am driving, there is no appliance or anything of substance running on DC and I always start having been plugged into Shore Power for weeks and fully topped up.I told you it was weird!Lloyd Riddle
RV Mechanic: Robert, RV Mechanic replied 2 months ago

OK

So do you know if the house batteries should charge off the alternator? Some RV's do and some do not, they use a solenoid or battery isolator to charge the house battery via the alternator. If that failed it could be the problem, some use the aux boost solenoid for that charging circuit.

What you can do is get a volt meter and test light. Let the engine run and check the battery voltage, if it is dropping then something is drawing on the system. IF you have that battery boost solenoid disconnect it and see if the voltage levels out, if that aux boost solenoid was bad it might be draining the battery down.

What you could also do to check for a draw is remove the main negative cable from the house battery and hook one end of the test light to the main cable and the other end to the neg battery post, the light should be really faint, if it is bright you have a draw, next go to the house fuse panel and pull each fuse one at a time and I would also see what other items are hooked up to the house battery on smaller cables, disconnect them and see if the draw goes away.

IF your fridge has a high humidity switch make sure it is OFF, the reason being if the switch is ON and the fridge is OFF then it will have a large draw, something I have seen over the years. Yours might be a little newer to have that humidity switch.

Finally what you could do is install a manual disconnect switch at the battery, it would be a lever you move back and forth to connect and dis-connect the batteries, that might be something to try until you can find the draw.

Hope this gives you some ideas, if you have more questions or concerns please feel free to contact me.

IF you are satisfied with my efforts please feel free to select a STAR rating on the page...

Robert

Ask Your Own RV Question
RV Mechanic: Robert, RV Mechanic replied 2 months ago

I got a message saying that you might have more info or questions, just respond back here as needed.

I am around daily and respond when I can...

Robert

Ask Your Own RV Question
Customer reply replied 2 months ago
Hi Robert - trying again. I submitted response twice but it does not show up. Bot***** *****ne - I think you might have missed what I said. The engine IS charging the battery - I know this because I can watch the four red led light meter climb when I start the engine. I also know there is no mysterious coach draw or drain. I know this because when I dry camp the batteries work fabulously - I hardly ever have to even run my generator. Nothing is drawing abnormally and my batteries last just great (after recharging them upon arrival due to them being dead while driving). So, it has to be something with the act of DRIVING that is causing this to happen? What is it about driving that could cause this?
RV Mechanic: Robert, RV Mechanic replied 2 months ago

OK

The only thing I can think of off hand that would cause this is if you have a battery boost solenoid and it is faulty. The battery boost solenoid ties the chassis and house battery together when you hit the switch on the dash to boost the starting battery in case it was low on voltage. In fact some boost solenoids also will charge the house batteries via the alternator when you are driving. It is about the only item I can think of that would cause the problems you are having and I might try to replace it and see if it solves the problems. IF you hit the battery boost switch inside you should hear it click each time, one way to find it. IT would have a cable from the starting battery and house batteries going to it.....

Hope this points you in the right direction....

Robert

Ask Your Own RV Question
Ask Robert Your Own Question
Robert
Robert
Robert, RV Mechanic
Category: RV
Satisfied Customers: 13,578
13,578 Satisfied Customers
Experience: 18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.

Robert 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:

Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV.

DutchUSA

Highly recommend this RV expert. Prompt, good and detailed answers were given. Very willing to help with genuine concern. I will ask for him next time.

JackUSA

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

< Previous | Next >

Meet the Experts:

gene

gene

RV Mechanic

1,100 satisfied customers

28 yrs exp in the industry

Nick

Nick

RVIA Certification

664 satisfied customers

5 years RV repair and reconstruction, Fleetwood RV Training course completion.

Steve F.

Steve F.

RVIA Certification

443 satisfied customers

Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant

Robert

Robert

RV Mechanic

13,578 satisfied customers

18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.

Randall

Randall

RVIA Certification

12,001 satisfied customers

RVDA/RVIA Master Certified Technician with many years experience.

Wayne

Wayne

RV Mechanic

825 satisfied customers

Work on several type of Rv engine, Trans, brakes

Chris (aka-Moose)

Chris (aka-Moose)

RV Mechanic

438 satisfied customers

16 years of experience

< Previous | Next >

Related RV Questions
I have a 2001 starcraft popup and i need to replace the main
i have a 2001 starcraft popup and i need to replace the main cable … read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,001 satisfied customers
I am trying to wire a trailer brake controller on my 2018
I am trying to wire a trailer brake controller on my 2018 tiffin allegro red 37pa … read more
Shawn Few
Shawn Few
AS
63 satisfied customers
I need right side head light for 1994 allegrbay motorhome
i need right side head light for 1994 allegrbay motorhome … read more
Wayne
Wayne
RV Mechanic
Vocational, Technical or Trade Scho
825 satisfied customers
How can I obtain a hook-up diagram for new batteries
How can I obtain a hook-up diagram for new batteries insralled in a 1999 National Dolphin. 2 -6 volt coach batteries and 1 12 volt ingine starting battery? Thak You Lee… read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,001 satisfied customers
FIRST 2 SLIDES COME IN LARGE SLIDE DOES NOT DO ANYTHING.
FIRST 2 SLIDES COME IN LARGE SLIDE DOES NOT DO ANYTHING … read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
0 satisfied customers
One of our 4 slides would not retract. 2018 jayco precept 36
One of our 4 slides would not retract JA: What's the make/model/year of your RV? Customer: 2018 jayco precept 36 T JA: What is the model/year of your RV? Customer: We just bought it last week JA: What… read more
Shawn Few
Shawn Few
AS
63 satisfied customers
My aft Ac is drawing 31amp ar start and 15 running. Would at
My aft Ac is drawing 31amp ar start and 15 running. Would at new start capacitor help … read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,001 satisfied customers
I have a 2004 Tiffin Allegro Bus, and am switching to
Hi, I have a 2004 Tiffin Allegro Bus, and am switching to heating for the cooler weather. I have 2 questions that I don't find answers to in my manuals. Can you help? … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
Slideout lock not working. Currently slide is out and lock
slideout lock not working. Currently slide is out and lock has locked the slide. Lock will not unlock … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
How difficult is it to replace hydraulic line for jacks on
How difficult is it to replace hydraulic line for jacks on Fleetwood Revolution coach? … read more
Robert
Robert
RV Mechanic
13,578 satisfied customers
The refrigerator stopped cooling first, then the front panel
The refrigerator stopped cooling first, then the front panel lights went out and the light inside stopped working. I checked the ac and dc power and it was fine. Is the control board the problem? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 2008 fleetwood terra class a motorhome, I have a
I have a 2008 fleetwood terra class a motorhome, I have a lot of wind noise coming in it seems like around front windshield , any helpful tips… read more
Chris (aka-Moose)
Chris (aka-Moose)
RV Mechanic
Vocational, Technical or Trade School
438 satisfied customers
I have a 2003 Holiday rambler with a nor cold N 821 that
I have a 2003 Holiday rambler with a nor cold N 821 that does not turn on. Previously it had given a code of A and would restart after doing a manual reset. I also tried it on lp. It started with a go… read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,001 satisfied customers
When we turn on the refridgerator i will not stay on it goes
When we turn on the refridgerator i will not stay on it goes to Pl it is a 2004 revalution … read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,001 satisfied customers
I have a 2002 Winnebago Journey, Freightliner/Cummins - the
hi, I have a 2002 Winnebago Journey, Freightliner/Cummins - the tachometer stopped working. Any thoughts? … read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
0 satisfied customers
The rear slide wont work. the breaker is tripped we dont
the rear slide wont work . the breaker is tripped we dont know where the box is … read more
Wayne
Wayne
RV Mechanic
Vocational, Technical or Trade Scho
825 satisfied customers
2003 Georgetown 325 DS hydraulic motor and module
2003 Georgetown 325 DS hydraulic motor and module replacement … read more
Wayne
Wayne
RV Mechanic
Vocational, Technical or Trade Scho
825 satisfied customers
Awning window crank assembly made by excell no longer
Awning window crank assembly made by excell no longer operated. Seems the gears (plastic) are worn out. Used on Right rear awning window on Winnebago Journey 2005. Dealer claims mechanism no longer ma… read more
Wayne
Wayne
RV Mechanic
Vocational, Technical or Trade Scho
825 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