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Repair guides and support for C/K pickup trucks sold by General Motors under the GMC brand, including the GMC Sierra.

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no running, nor dims only brights .

I have no running, nor dims only brights .

It's on

a 1998 GMC 2500 single cab. Any suggestions

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"It's on" lol indeed

This is a good one.

Do you have dash lights, cab lights, brake lights, reverse lights, turn signals?

Are you able to turn on the running lights with no headlights? If so do they work?


Yes I have everything all lights

even turn, hazards, even brights work, only no running lights or regular lights, ( dims ).?


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If the headlights on your 1998 GMC 2500 single cab are only working on high beam (brights) and not on low beam (running or dims), there are a few things you can check:

  1. Check the headlight bulbs: It is possible that both low beam bulbs have burned out. Try replacing both bulbs to see if that solves the problem.
  2. Check the headlight fuses: There may be separate fuses for the low and high beam headlights. Check the fuse box and replace any blown fuses.
  3. Check the headlight relay: The headlight relay is responsible for switching between low and high beam headlights. If the relay is faulty, it may be stuck in the high beam position. Try replacing the relay to see if that solves the problem.
  4. Check the headlight switch: The headlight switch may be faulty, preventing the low beams from turning on. Try replacing the switch to see if that solves the problem.

If you are not comfortable performing these checks yourself, it may be best to take your truck to a professional mechanic for diagnosis and repair.

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