20 Most Recent
1990 GMC Suburban Questions & Answers
Heater bower not working
This question is asked so often it should be common answer by now. Check fuse, then ballast resistor (located under hood on heater box), then run hot wire directly to motor for quick test if motor is bad. If everything checks out good, bad heater switch is only thing left.
1/13/2015 9:59:34 PM •
1990 GMC...
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Answered
on Jan 13, 2015
I have a 1989 chevy s10 horn radio and dome light
Check inside the drivers and passenger side door jam for the little push in type switch. 9x out of 10 one or the other will be causing the short to the dome fuse. These little **** get rusty and also get alot of wear and tear from the door opening and shutting over and over. These switchs are what causes your dome light to come on when you open your door and or likewise they shut your dome light off when you shut you door. A very good way to test to see if one of these little switchs is the couprate is to take and hook up a voltage light into the negative side battery post after you disconnect the battery negative line..
If your voltage light is on than that would mean that you have a short somewhere in your system. Now, since you already know that you are blowing the dome fuse then your already halfway there. With the light on your votage light still on indicatin a short, unscrew the little switch on the door jam and disconnect the power wire from it. Check to see if the light on your voltage light is still indicating a short, if not then you can be sure that the door jam was the coulprete. Hope this is of help.
2/28/2013 2:03:07 AM •
1990 GMC...
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Answered
on Feb 28, 2013
Why does my 1990 suburban keep randomly blowing
Scroll up and LISTEN to the guy talking about a SHORT. That's what it is. Take off the air cleaner assembly. Lift all the wires up and off the engine, pull the big wire loom a half inch out of the hole it disappears in going through the firewall. Keep doing this until the fuse stops blowing. Took me ten seconds. I still don;t know which wire it is, but I am buying some rubber fuel line and/or wiring loom protector to insulate everything off the valve covers, etc. Be sure to pick up extra 15 amp fuses in case it happens again, and be ready to tell anyone who drives the thing what to do.Case: 1990 GMC 1500 SLE Suburban. Ran just fine, then the ignition shut off when I hit a random bump or pothole. Cost me a $750 tow before I got on here and did the wiggle test. The fuse stopped blowing. I will update if my fuel line/insulation idea didn't work, but I think it will. I will also tape every exposed wire with electricians tape. . .
10/7/2012 11:43:54 PM •
1990 GMC...
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Answered
on Oct 07, 2012
1990 Chevy GMC Suburban alternator wiring
Well, according to my diagrams for 88-94 models, the alternator only uses the red and brown. There are pink-black wires that power some of the sensors and solenoids but should go to a fuse marked ECM in the fuse box. Have you tried hooking up the harness without using the pink-black wire ?
8/31/2012 2:46:12 PM •
1990 GMC...
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Answered
on Aug 31, 2012
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