GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

I have a 1990 GMC 2500. Killed it at the gas station tried…

Customer Question
I have a 1990...

I have a 1990 GMC 2500. Killed it at the gas station tried to start it got a real bad sound like a bad starter hit it a second time and all my lights in my cab went out. Headlight still work but no power in the cab at all. I've replaced the starter I've replace the relay in side the steering column a ignition relay up under the dash ignition fuses and I've tested every single fuse and relay and power and ground wire on the truck I've had an ase-certified mechanic crawl all over the truck and he is absolutely stumped he can't figure it out turn the key and just nothing all of a sudden

Mechanic's Assistant: Is the power loss consistent, or does it fluctuate?

There is absolutely no power when you turn the key

Mechanic's Assistant: Are you fixing your 2500 yourself? What have you tried so far?

I replace the starter myself and I've had an ase-certified mechanic out here for 2 days we have tested every single electrical components replaced every relay and every fuse we've tested everything with a power kit and simply cannot find the answer

Submitted: 8 months ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 14 minutes by:
10/1/2017
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 30,268
Experience: GM Grand Master Technician 2007. 14 year experience.
Verified

Hi there, I am Cam.

One question to start with, I see nothing about the battery. Did you check it or have it tested? Perhaps swapped with a known good one?

Ask Your Own GMC Question
Customer reply replied 8 months ago
This was an all of a sudden problem at a gas station battery is fairly new with plenty of voltage headlights come on no power to the
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago

OK do you get power at the ignition switch? I suggest using a test light not a volt meter or power probe.

Ask Your Own GMC Question
Customer reply replied 8 months ago
Replace the ignition switch inside the steering column still nothing use the power light on every single relay ground wire everything all over the truck cannot find the answer
Customer reply replied 8 months ago
We've replaced the starter the ignition switch and ignition relay up under the dash the ignition fuse on the fuse box still no power in the cab nothing when you turn the key
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago

OK, but does the ignition switch get its full power?

Ask Your Own GMC Question
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago

Ok, automatic or standard?

Ask Your Own GMC Question
Customer reply replied 8 months ago
Automatic
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago

Ok, at the starter, is there power at the purple wire with the key in start?

Ask Your Own GMC Question
Customer reply replied 8 months ago
there is
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago

Understood, so this means its not the control side, so new starter means its not the starter. So its either wiring (heavy gauge) to the starter, engine ground or something is not letting the engine turn. Can you manually turn the engine with a wrench?

Ask Your Own GMC Question
Customer reply replied 8 months ago
Affirmative
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 8 months ago

Ok so power issue. with a test light, put it on DC volts, measure exactly as instructed.
meter negative to battery negative, meter positive to engine block, have someone turn the key and record voltage reading.
Second test, meter negative to battery positive, meter positive to starter battery stud, have someone try to start.

Again, recored EXACT readings please.

Ask Your Own GMC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Gm Tech (Cam) Your Own Question
Gm Tech (Cam)
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 30,268
30,268 Satisfied Customers
Experience: GM Grand Master Technician 2007. 14 year experience.

Gm Tech (Cam) 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:

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

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

30,268 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
I have a 92 sierra replaced alternator and battery it sat
i have a 92 sierra replaced alternator and battery it sat for a couple days dead battery..i took battery back charged it say thing happen … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,332 satisfied customers
My headlights won't go off. I have No idea how to check the
I have Tried turning the switch to off. There is also a button that controls the dome an fog lamps. I have Tried pushing it in and out. … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
Both low beam headlights not working; high beams fine,
Both low beam headlights not working; high beams fine, running lights fine … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
99 safari van, headlights won't turn off, fan motor runs
99 safari van, headlights won't turn off, fan motor runs continuously, right indicators stay on, not flashing. Ignition off, key out. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
No interior power, have power to fuse box and battery is
No interior power, have power to fuse box and battery is fully charged … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
Headlights go on by their self any time day or nite. My
headlights go on by their self any time day or nite … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
30,268 satisfied customers
Headlights were working yesterday evening. We got in to
Headlights were working yesterday evening. We got in to leave this morning . . . No headlights. 2004 Yukon Denali We are wondering about a fuse but should we consider other possible issues? Thanks… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
DIC stopped working. 2004 yukon. Diconnect battery and
I have located bot fuse panels but only one had a DIC… read more
JFN1
JFN1
ASE Certified Technician
Vocational, Technical or Trade Scho
270 satisfied customers
When headlight switch is on brings brake lights on solid and
when headlight switch is on brings brake lights on solid and blinkers will not work … read more
Mechanic01
Mechanic01
2,813 satisfied customers
To replace the low beam headlight bulb on the passenger
To replace the low beam headlight bulb on the passenger side, it would help to remove the air cleaner for my diesel GMC 2500 truck. It's an 09. How do you remove the filter assembly? I've got the cove… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
362 satisfied customers
Low beam headlights wont work. Both lights arent working
both lights arent working checked fuses relay etc removed bulb it does not look blown … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
30,268 satisfied customers
Battery will not charge. new battery and new alternator. The
battery will not charge. new battery and new alternator … read more
Cesar Jimenez
Cesar Jimenez
Owner/CEO
Vocational, Technical or Trade School
171 satisfied customers
New battery drains overnight. No but the battery is new. The
No but the battery is new. The same thing happened before the battery was replaced. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I'm replacing the old headlights with led headlights. I was
Second opinion] I'm replacing the old headlights with led headlights. I was wondering what's the easiest way to change out the bulbs on a 2007 GMC Sierra 2500hd? … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
I'm replacing the old headlights with led headlights. I was
I'm replacing the old headlights with led headlights. I was wondering what's the easiest way to change out the bulbs on a 2007 GMC Sierra 2500hd? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Idle engine. 285000 VVM envoy 2003 XL. Also battery not
This just happened todayhvnt had a chance to do anything as yet… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
Battery saver light came on. Battery test with the engine
Battery saver light came on. Battery test with the engine off at 12.7 VDC, With the engine running at an idle 15.7 VDC. Trying to locate the issue … read more
Mechanic01
Mechanic01
2,813 satisfied customers
With the engine running an turn the headlight switch on the
with the engine running an turn the headlight switch on the engine goes into reduced power mode. If you pull the dimmer the engine dies. … read more
roy
roy
Associate Degree
3 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