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Headlights, interior lights and alarm stopped working on 1990 gmc sierra I think it might be the emc but I checked the viper alarm and no issues

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I suppose you checked all the fuses ???

and fixed any bad bulbs
sounds like some common voltage connection has failed
usually a fuse or a bad scotchlock connector solder connections instead scotchlock fail and rust up causing issues like this

Posted on Dec 04, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 1985 gmc sierra truck headlights wont work. its not the bulbs

well we just fixed our truck it was a wire that connects to the starter had some out! might want to see if there are any wires disconnected there

Posted on Dec 31, 2008

Annimater
  • 37 Answers

SOURCE: Headlights won't work on my 1996 GMC sierra

My best guess is a bad ground common to both headlights.

I think the 50 amp fuse is for your starting circuit, not the headlamps, which is a 15 or 20 amp fuse. Did you try both dim and bright settings?

Since you don't know which fuse is for what, just remove and replace each fuse one at a time. As you go, visually inspect each fuse and test for continuity with an ohmmeter, then use a pink pearl eraser to clean the wafer tips before replacing. Do this methodically one at a time and replace any bad fuses with THE EXACT SAME AMPERAGE RATING.
Now, if your fuses are clearly marked and you do have a 50amp fuse in your headlamp circuit then you need to put the correct amperage in ASAP. If you have a 50 amp in the headlight circuit the whole circuit could be fried before the fuse blows, which is why you NEVER replace a fuse with a higher rated amperage.

Once you've worked over the fuseblocks go to the headlamp circuit and follow the wires and plugs coming from the lamps and going to the fuse block. Look for ground connections and tighten those, especially those coming from the headlamp wiring harnesses. If your lamps are good, the fuses are good, the plug connections are clean and making good contact and your grounds are good then all thats left is your headlamp switch and wiring to and fro. If you don't know what the plugs are for no harm can come from cleaning and reconnecting them, so you can't go wrong if you just do one at a time in a methodical fashion.
I have an old S-10 and the headlamp switch is junk- I have to hit it with contact cleaner every once in a while because Houston air quality is poor and there is a lot of ozone- all this corrodes connections- fuse maintenance cures a lot of ills.
After the fuseblocks I'd start by checking the actual headlamps to make sure they are working (check each filament for continuity or put 12v to it to test) and clean the contacts.

Then you can work your way back to the fuseblock and switch checking your plugs and connections. Its all pretty straightforward, just be methodical and clean your plug connections as you go. No schematic needed- just a little patience.

One thing to think about if your headlamps are both blown is that your alternator may be overcharging, or the regulator isn't working properly and your headlamps are blown because they got hit with too high a voltage. Eventually this will sulfate the battery and cause an internal short- if it is bulging you can be sure this is happening. So get your alternator and regulator circuit checked if this is the case.
Good luck, If this fixed ya then please rate this solution

Posted on Jun 21, 2009

  • 101 Answers

SOURCE: 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.

Posted on Oct 02, 2009

  • 432 Answers

SOURCE: 1990 GMC Sierra 1500 pickup. Windshield wipers, Cruise Control

May want to look at replacing the wiper circuit board.It is located on the firewall adjacent to the wiper motor and has a some what square black cover with 3 torx screws and wireing harness pluged into the side.We had a truck that every time you washed it the wipers would stay on until it dryed out.You can try removing it and spaying it down with contact cleaner just watch the brease on the two contact tips.Well hope this helps.

Posted on Feb 05, 2010

  • 28 Answers

SOURCE: why won't my headlights shut off during the day

You have your headlight control set to auto and your light sensor on the top of the dash is either faulty or fallen out of it's bracket and can not sense light.. turn your headlight control to off and use your headlight switch in manual till you get your sensor problem fixed..

Posted on Jun 07, 2010

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