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Username Post: 85 K10 With no Hazard Lights        (Topic#347087)
Chevy Joe 
Forum Newbie
Posts: 6

Reg: 09-09-17
09-10-17 07:26 PM - Post#2707340    

I just purchased a 1985 Chevy K10 and the hazard lights don't work. All other lights appear to work properly. When I turn on the hazard lights, I can hear about 6 or 7 rapid clicks and a slight dimming of interior lights, then the hazard fuse blows, which sounds like a short to me. I'm completely new to these trucks and not sure how to find the problem.

What I've tried so far:

1. Swapped flasher pots from turn signals to hazards, and turn signals still worked, so the flasher is fine.

2. Hooked a wire from the battery positive terminal to a spare flasher and from the flasher to the wire bundle feeding the front marker lights (3 dark brown wires bundled together which go to the left marker light, the front marker light and head off to the right side). When I hooked the wire from the battery through the spare flasher to this bundle, the hazard lights blinked normally, until I turned on the headlights, at which time they stopped blinking. (This was done with the truck off) I was trying to determine if the problem was in the lights or the switch. I'm thinking it may be the switch, but I'm just guessing here. I have the wiring diagrams, but they show an orange wire and the previous owner appears to have spliced in his own colors and I'm not sure how to check the whole wire for shorts anyway since they seem to be connected to so many things.

Any advice would be greatly appreciated!



 
LMC Truck
junky 
Frequent Contributor
Posts: 2256

Loc: Northeast CT
Reg: 06-27-10
09-11-17 05:15 AM - Post#2707365    
    In response to Chevy Joe

Check the interior dome light for an incorrect bulb. Some dome lights use a single contact at the end of the bulb, and others use a double contact at the end of the bulb. The wrong bulb will give you a short condition. Other than that, you might just have to start going back to the original wire harness, and splice in the correct wire colors just to trace out a short like this. When presented with a problem like this, I usually start with the easy stuff, like removing one bulb at a time, try the flashers, and if no change, keep removing bulbs one at a time, until you find the change. If with all bulbs out, it still shorts, then it is in the wiring to the bulbs, not in a socket. Electrical problems are difficult, especially when you have a limited amount of experience chasing them down. If all else fails, look for a used harness at a pick a part yard, and use that wire for your repair. If you are lucky enough to find the same year and model, take the whole harness, and replace yours. More work than I would want, but sometimes, more is actually less, because the problem is resolved without a lot of aggravation.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 
Chevy Joe 
Forum Newbie
Posts: 6

Reg: 09-09-17
09-11-17 06:00 AM - Post#2707369    
    In response to junky

I appreciate the help!

I think maybe the previous owner replaced the headliner, because I don't have a dome light or even a spot for one, unless maybe some trucks didn't come with one?

That's a good suggestion about taking each bulb out one a a time. My initial thinking was by using that rigged flasher and wire from the battery to make the bulbs blink (that worked successfully) that meant both the bulbs and the wires to the bulbs were good, so the problem had to be somewhere in the dash or column. Am I thinking wrong there?



 
gchemist 
Senior Chevytalk Moderator
Posts: 24157
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-11-17 06:32 AM - Post#2707371    
    In response to Chevy Joe

Welcome to the site. I hate tracing down bad wiring. I'm no electrician. I have trouble making even good crimps.
To help me, I bought a Power Probe IV. Great tool to check 12V/5V components and wiring. A simple probe tells if it has power or it's a ground.

I can't remember. Is the hazard part of the turn signal mechanism? If so, the signal mechanism a know problem short area.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
Chevy Joe 
Forum Newbie
Posts: 6

Reg: 09-09-17
09-11-17 07:09 AM - Post#2707377    
    In response to gchemist

Thanks for the help!

I'll look into that Power Probe. I could use all the help I can get. Right now I have a digital multimeter and a simple circuit tester probe with a light.

Yes, the hazard switch is part of the turn signal switch. Since the turn signal switch is finicky anyway, I ordered a new one. I'm not looking forward to taking that column apart, but with any luck, it will fix the hazard lights as well. I can't find a replacement hazard light button, though. I still have mine, but I don't know if they go bad.

At any rate, I was hoping to determine where the problem with the hazard switch/lights is while waiting on that turn signal switch in case the problem lies elsewhere. I just don't have any other ideas on how to check the wires for shorts.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24157
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-11-17 05:29 PM - Post#2707425    
    In response to Chevy Joe

Check all the bulbs. Any different or incorrect bulb will cause light problems.

If you like tools. Check out a Load Pro to go with your digital voltmeter. Search YouTube for videos. It's great to find shorts and bad grounds.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
Chevy Joe 
Forum Newbie
Posts: 6

Reg: 09-09-17
09-12-17 03:05 PM - Post#2707505    
    In response to gchemist

Good info about the bulbs, thank you.

I looked up the Load Pro and ordered one after checking it out. Between the tool and the videos, it should be MUCH easier chasing down wire faults in my new truck, so thank you!!



Edited by Chevy Joe on 09-12-17 07:11 PM. Reason for edit: No reason given.

 
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