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Old November 15th, 2010, 02:17 PM   #1
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Default '88 Suburban - No Running Lights

'88 Suburban 4x4 with 6.2L diesel. Everything worked fine last week. I literally didn't touch it for like 5 days, then the other night when I went to drive it to town, I noticed I didn't have running lights or gauge lights. The headlights and brake lights still work. The running lights and gauge lights DEFINITELY worked last week. I put a new fuse in and it popped as soon as I tried turning them on again. One of the chassis grounds in the engine bay had been broken since I bought it a few weeks ago, so I fixed that, but it didn't fix the problem.

I pulled all of the bulbs for the running lights out of the truck and it was still popping the fuse. The headlight switch out of my other Suburban didn't fix the problem either. I looked at the wires for the trailer lights and didn't see any shorts or worn through wires or anything.

Any ideas?
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Old November 15th, 2010, 02:29 PM   #2
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I've had two of these model tucks and light wiring is always an issue. My current truck (2000 K2500) was having similar issues. I ended up rewiring all of the rear wiring including the trailer lights and new ground. The tail light harness connector was bad. Other common problems are the brake light switch going bad and creating a short or the dreaded signal indicator stalk. All lighting functions run through the turn signal stalk, if there is a short in there it must be replaced. Test the brake switch and tail light harness connector for proper function to start. Also try moving the turn signal lever to see if it stops the short.
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Old November 15th, 2010, 02:42 PM   #3
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I suggest pulling out the tail bulbs. if by chance one shorted it would blow the circuit when grounded. turn signals are already on a flasher (circuit breaker) so they wouldn't see the short.
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Old November 15th, 2010, 02:46 PM   #4
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My 88 had the running lights, gauge lights and horn all on the same fuse and I i held the horn too long it would blow it. So maybe trace for some sort of short in that circuit as well.
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Old November 15th, 2010, 03:01 PM   #5
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now that you mention it isn't the Cig lighter on the same line as the dash lights?
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Old November 15th, 2010, 03:18 PM   #6
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Quote:
Originally Posted by PCK_4xCustoms View Post
My 88 had the running lights, gauge lights and horn all on the same fuse and I i held the horn too long it would blow it. So maybe trace for some sort of short in that circuit as well.
I believe this circuit is fed power through the brake light switch.

Last edited by BigBlockBlazer; November 16th, 2010 at 08:08 AM.
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Old November 15th, 2010, 04:10 PM   #7
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After looking at it more, I realized there were connectors on the rear end of the wiring harness for the taillights. I disconnected both of them and tried the running lights: no blown fuse. Plugged the one back in that was just the lights and not the trailer lights: no blown fuse. I cut the the power wire for the trailer lights and plugged the harness back in: All of the running lights work and the fuse is no longer blowing! There wasn't a plug to hook the trailer lights to a trailer, just bare wires, so I'm not too worried about that working right now.

Thanks for all of the suggestions.
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Old November 16th, 2010, 08:09 AM   #8
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I believe this circuit is fed power through the brake light switch.
After looking at my wiring diagram my above statement is false and I made myself drink four beers as punishment.
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Old December 1st, 2010, 08:27 PM   #9
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That's what I did. I just ran wires from the battery to a switch I bought at autozone and ran the wires throught he bed (To protect from tearing up while of roading) and ran them to the center wire for the brake lights. Flip the switch and the tail lights comeon, but I still don't have dash lights.
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