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Old 12-10-2016, 11:48 AM   #1
b79holmes
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1990 Suburban Headlight Problem

We replaced the headlight switch which worked fine for a time.

A few weeks later the headlights after being on for a few minutes then randomly go off and on but the parking and tail lights remain on.

Is this a ground problem? Where is the ground wire & connections?

Could it be something else?

Thanks,
Bill
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Old 12-20-2016, 09:22 PM   #2
tobiahr
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Re: 1990 Suburban Headlight Problem

there should be a headlight relay for that model. that may be going bad and would have the same symptoms

correction....there may be a headlight relay
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Old 12-20-2016, 09:40 PM   #3
tobiahr
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Re: 1990 Suburban Headlight Problem

looking at the wiring diagram it could also be the high/low beam selector as the parking lights are on a branch circuit that does not go through the selector.
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Old 12-20-2016, 09:42 PM   #4
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Re: 1990 Suburban Headlight Problem

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Old 12-21-2016, 11:19 AM   #5
Ski-me
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Re: 1990 Suburban Headlight Problem

That looks like the newer body style 88+ trucks.

You need the R/V wiring diagram for the 1990 or 1991. (1989 does not have rear abs brakes but that doesn't really matter too much here).

I replaced my Hi/Low switch that is mounted on the steering column, down by the brake pedal. Connected with a metal rod. Good as new now. Might also check the connections at the headlamp assembly. Seen those get loose and go bad.

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Old 01-21-2017, 06:28 PM   #6
b79holmes
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Re: 1990 Suburban Headlight Problem

Problem solved.

After doing a little research, I found a couple of other people who had similar headlight blinking issues on their trucks, and each time it was the headlight switch itself.

I finally got around to ordering another one and I just installed it today, which has solved the issue.

The faulty switch was a cheaper reproduction, so this time I got a real Delco NOS part to replace it with. And yes, the tuck is a V1500 Suburban.

Thanks for the help
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