1980 K-2500 Gmc with electrical problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

trevor3240 · 12-20-2006, 12:10 AM

My truck is an 80 Gmc when you are driveing with out the headlights on and step on the brake the brake lights and the insterment lights and the turnsignals on the front all come on. but the turn signals work, As soon as the lights come on i have no left turn signal no brake lights, but the right turn signal works. And nomatter what i do my hazards done work. There is a rats nest of wires behind the dashboard and my steering wheel is lose at the tilt colum. Any help would be apresiated. I replaced a fuse it worked fine for about an hour and now it is back to being broken. The fuse hasnt poped.

blink32 · 12-20-2006, 07:58 AM

You just have to start tracing wires. Start with the easy stuff, find all the grounds, clean the connection points on them. That alone might fix it. It seems like you have power going back through the circuit. It could be at a bulb socket or in the dash. Check the plug connections behind the intrument cluster. If none of that works time to start chasing wires.

I personally ended up with a bad headlight switch when I had similar problems to you. $7 switch later I was good to go.

us111 · 12-20-2006, 11:06 AM

had almost excact same problem,,check to see if the 4 way flasher is pushed in,mine didnt have a 4 way flasher installed in fuse box,accidently pushed in button,drove me nuts,,pulled out switch,problem solved,i have an old post about it in electrical section..could be something else but sure sounds like what mine was doing. make sure the 4 way button is disengaged,if that fixes everything lighting up problem,,then check to make sure there is a working flasher installed in fuse box..

trevor3240 · 12-20-2006, 05:53 PM

k thanks for the help hopefully that will fix it

Russell · 12-20-2006, 10:21 PM

My 80 K25 truck had a similar problem -- It was a short in the steering column wiring, which, like yours, was kinda loose.

Its very easy to fix both the slop in the steering column, and replace the signal cam

Just be happy yours doesn't do everything mine did -- Mine honked the horn whenever I stepped on the brake, lol

trevor3240 · 12-22-2006, 04:55 AM

ya that would suck haveing youre horn honk whenever you step on the brake

12-20-2006, 12:10 AM	#1
trevor3240 Registered User Join Date: Jan 2006 Location: Idaho Posts: 7	1980 K-2500 Gmc with electrical problem My truck is an 80 Gmc when you are driveing with out the headlights on and step on the brake the brake lights and the insterment lights and the turnsignals on the front all come on. but the turn signals work, As soon as the lights come on i have no left turn signal no brake lights, but the right turn signal works. And nomatter what i do my hazards done work. There is a rats nest of wires behind the dashboard and my steering wheel is lose at the tilt colum. Any help would be apresiated. I replaced a fuse it worked fine for about an hour and now it is back to being broken. The fuse hasnt poped.

12-20-2006, 07:58 AM	#2
blink32 Registered User Join Date: Dec 2003 Location: OTR Posts: 338	Re: 1980 K-2500 Gmc with electrical problem You just have to start tracing wires. Start with the easy stuff, find all the grounds, clean the connection points on them. That alone might fix it. It seems like you have power going back through the circuit. It could be at a bulb socket or in the dash. Check the plug connections behind the intrument cluster. If none of that works time to start chasing wires. I personally ended up with a bad headlight switch when I had similar problems to you. $7 switch later I was good to go.

12-20-2006, 11:06 AM	#3
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	Re: 1980 K-2500 Gmc with electrical problem had almost excact same problem,,check to see if the 4 way flasher is pushed in,mine didnt have a 4 way flasher installed in fuse box,accidently pushed in button,drove me nuts,,pulled out switch,problem solved,i have an old post about it in electrical section..could be something else but sure sounds like what mine was doing. make sure the 4 way button is disengaged,if that fixes everything lighting up problem,,then check to make sure there is a working flasher installed in fuse box..

12-20-2006, 05:53 PM	#4
trevor3240 Registered User Join Date: Jan 2006 Location: Idaho Posts: 7	Re: 1980 K-2500 Gmc with electrical problem k thanks for the help hopefully that will fix it

12-20-2006, 10:21 PM	#5
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Re: 1980 K-2500 Gmc with electrical problem My 80 K25 truck had a similar problem -- It was a short in the steering column wiring, which, like yours, was kinda loose. Its very easy to fix both the slop in the steering column, and replace the signal cam Just be happy yours doesn't do everything mine did -- Mine honked the horn whenever I stepped on the brake, lol __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

12-22-2006, 04:55 AM	#6
trevor3240 Registered User Join Date: Jan 2006 Location: Idaho Posts: 7	Re: 1980 K-2500 Gmc with electrical problem ya that would suck haveing youre horn honk whenever you step on the brake



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.