Question about 1985 GMC C2500

1 Answer

1985 gmc sierra

Thanks for the advice yeaterday wondering if i can ask more of a quiestion changed the dimmer switch it was bad but still no lights the guy at auto zone said it could be a bad wire going into the fuse box but i have no clue how to check that or change that Please any advice would be great

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,990 Answers

No Problem-Glad to Help! About the Best way to get to that wire and find out which one it really is is to get the Voltage Tester that I told ya about Before. Orielley Auto Parts has the best Selection and Really know their Stuff. If you don't have one near you go to Auto Zone and tell them that you need to locate a Faulty wire as Cheap as Possible and they can Help ya. When you get to that Point open the Hood and disconnect the Headlight harness from the Light (will work the same with other lights too). With the Headlights OFF and the Ignition turned to Start Check the Gold Leads inside the Harness for Power. The Voltometer Instructions will let you know what you are looking for, Probably 12 on the Meter will let you know that there is Power going to the Lights. If that is all good then go to the Fuse Box and Locate ALL the Fuses that have to do with Lights. Leave the Fuses in and Check the Gold Parts where the Fuse fits into the Box. If you find it you can always run an External wire from the Lights back to the Box. Sometimes the Fuse boxes are a REAL BEAR to get to and work with. Let me Know what you Find!

Posted on Dec 31, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Headlights are on, turn bright lights on and lights go off.

Sounds to me that you have a bad dimmer switch.

Mar 31, 2013 | 1992 GMC Sierra K1500

1 Answer

1998 GMC Sierra has running lights and high beams but no low beams. Headlight switch is not the problem

first off, be sure your low beams aren't both burned out. it happens all the time. next check your dimmer switch operation. (i'm betting on low beams burned out) good luck.

Dec 21, 2010 | 1998 GMC Sierra

1 Answer

2001 GMC Sierra headlights won't come on. Located 3 each 10Amp fuses that were blown and replaced them, however, headlights didn't come on.

what fuses were blown and replaced? Theres a TBC fuse under the hood, along with a Headlamp Relay. Theres a R HDLP and LT HDLP fuses, make sure they are getting power, and are good. If the LT HDLP and RT HDLP fuses are good AND getting power, then the TBC fuse and the relay is good. then I would suspect the Hi-Lo dimmer switch bad. The LOW beam ground wire is YELLOW, the high beam ground is PURPLE. see if high beams work, if they do, then I suspect the dimmer switch is bad.

Dec 17, 2010 | 2001 GMC Sierra Crew Cab

1 Answer

Drl work but no low beams on my 1998 sierra..

either the low beams are burned out ,or the dimmer switch is bad.

May 10, 2010 | 1998 GMC Sierra

1 Answer

I have a 2002 GMC sierra 1500. Instrument Lights Not Working

When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.

Oct 02, 2009 | 2002 GMC Sierra 1500

2 Answers

Lost my headlights and tail lights

if you have tilt steering the problem is in the column a broken grand wire

Jul 24, 2009 | 1998 GMC Sierra

1 Answer

Dash lights go out-

It could be a faulty dimmer switch. If the switch is fine then it might be a loose connection behind the gauge cluster. If you haven't pulled the the cluster off before. The plug is stationary and when you pull the cluster away it unplugs automatically. ButI would check the dimmer first.

May 22, 2009 | 1989 GMC Sierra

1 Answer

1985 GMc sierra boggs out at idle

Sounds to me that the carb. is bad, most likely its a Qjet, best thing to do here is to have it rebuilt, but better yet get a replacement, unless you know someone that will rebuild it for you witch i dought, they don't call them Qjunk for nothing.

Feb 24, 2009 | 1985 GMC K1500

1 Answer

No brake lights.

I can email you a copy of the wiring diagram ... I have an 86 and the manual

Jan 02, 2009 | 1985 GMC K1500

1 Answer

Headlamps for a 2006 gmc sierra aren' t working

i would try replacing headlight switch....

Jun 08, 2008 | 2006 GMC Sierra

Not finding what you are looking for?
Cars & Trucks Logo

86 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides