Need some wiring help.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Z28Owner · 05-18-2003, 03:31 PM

On my 71 truck, I replaced both brake lights and flasher box. I cant figure out why one works and other doesnt. My drivers side turn signals, brake lights and parking lights all work. My parking lights work on Pass side, but no turn signal or brake light. I swapped bulbs and still same thing, so Its not a bad bulb. I have checked all the wiring around the bed its all fine. Could someone fill me in on how or what this could be if you have had the same problems, TIA - Jason

TROYLV · 05-18-2003, 04:15 PM

could be a wire in the steering column or a bad turn signal switch.

Mackey · 05-18-2003, 05:21 PM

http://www.geocities.com/chevroletc1070/taillghts.html Go here for wiring layout. Double check the socket outlet, could have a bad spot if the other bulbs aren`t working in it. Then back trac the wiring bed-column. Sometimes it`s just the socket harness.

71elect · 05-18-2003, 05:28 PM

Jason, I had a similar problem right after I purchased my 72'. With the brakes applied and the right turn signal initiated, my left rear brake light would shut off while the right rear light still flashed for the turn signal. After swapping bulbs and checking the wiring and connectors, it all pointed to the turn signal switch in the steering column. Once the switch was replaced all was back to normal.

**old Rusty C10** · 05-18-2003, 05:49 PM

check grounds too!!! and the flasher althought the brake light would work then with a bad flasher

Blue Beard · 05-18-2003, 11:09 PM

Have to go along with the possible ground.....scrape things or a little sanding to get better ground..........

Longhorn Man · 05-18-2003, 11:29 PM

Not a ground, the parkign light works off the same ground. If the added amprage (which needs better grounds) was a probelm, the parking light would go out and (most likely) not come back on untill the assembly was fiddled with.
It is possable....but not very likely.
I'd investigate the turn signal switch. Try wiggling the lever and even tugging on the harnss where it goes into the column as some one watches the light.

05-18-2003, 03:31 PM	#1
Z28Owner ......................... Join Date: Nov 2001 Location: benton, ky Posts: 285	Need some wiring help.... On my 71 truck, I replaced both brake lights and flasher box. I cant figure out why one works and other doesnt. My drivers side turn signals, brake lights and parking lights all work. My parking lights work on Pass side, but no turn signal or brake light. I swapped bulbs and still same thing, so Its not a bad bulb. I have checked all the wiring around the bed its all fine. Could someone fill me in on how or what this could be if you have had the same problems, TIA - Jason __________________ 1971 LWB Chevy C-10 350/350 3:42 eaton

05-18-2003, 04:15 PM	#2
TROYLV Registered User Join Date: Oct 2002 Location: LAS VEGAS, NV. Posts: 157	could be a wire in the steering column or a bad turn signal switch. __________________ troy wilson

05-18-2003, 05:28 PM	#4
71elect Registered User Join Date: Nov 2002 Location: Southern Idaho Posts: 59	Jason, I had a similar problem right after I purchased my 72'. With the brakes applied and the right turn signal initiated, my left rear brake light would shut off while the right rear light still flashed for the turn signal. After swapping bulbs and checking the wiring and connectors, it all pointed to the turn signal switch in the steering column. Once the switch was replaced all was back to normal. __________________ 72Chevy swb 4x4 71GMC swb 2x4

05-18-2003, 05:49 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,345	check grounds too!!! and the flasher althought the brake light would work then with a bad flasher __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

05-18-2003, 11:09 PM	#6
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	Have to go along with the possible ground.....scrape things or a little sanding to get better ground.......... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

05-18-2003, 05:21 PM	#3
Mackey Registered User Join Date: May 2003 Location: Somewhere In, Texas Posts: 34	http://www.geocities.com/chevroletc1070/taillghts.html Go here for wiring layout. Double check the socket outlet, could have a bad spot if the other bulbs aren`t working in it. Then back trac the wiring bed-column. Sometimes it`s just the socket harness.

05-18-2003, 11:29 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Not a ground, the parkign light works off the same ground. If the added amprage (which needs better grounds) was a probelm, the parking light would go out and (most likely) not come back on untill the assembly was fiddled with. It is possable....but not very likely. I'd investigate the turn signal switch. Try wiggling the lever and even tugging on the harnss where it goes into the column as some one watches the light.



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