Author Topic: Brake/hazard/turn signal problems  (Read 4124 times)

Offline Yams

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Brake/hazard/turn signal problems
« on: November 29, 2014, 08:40:55 PM »
Hi there, having problems with my Brake lights/hazards/turn signals. If I turn the truck on (acc on, engine not on), my brake lights don't work (sometimes the right one does, sometimes it does't - seems to depend on how recently I touched turn signals/hazards 9last 10 min or so...). If I turn the hazards on, the passenger side light blinks, the drivers side does not - and if I brake only the right one brakes. If I put my turn signal on (either right or left, doesn't matter), both lights begin to blink (because the hazards are on). If I then step on the brakes, both lights go solid. If I have one of the turn signals on, and I press the brake, both signals work (one turn, one brake). If I turn my running lights on (half pull on the light stick), both of the turn/brake/hazards lights turn on. But, the hazards won't work, the brake lights won't work, and the right turn signal won't work. I tried replacing the flasher relay, but that didn't seem to change anything. so I went back to the old one... I've attached the wiring diagrams and a photo of my lights. the bottom light is the backup light (never works), the side is a running light (which goes on when I pull the stick half/full) and the top right is the hazard/brake/turn.

Thanks for any/all advice

I have an 85 Chevy Silverado with a 6.2l diesel...

the links are just to the images incase the images don't work







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Offline hatzie

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Re: Brake/hazard/turn signal problems
« Reply #1 on: November 30, 2014, 01:23:15 PM »
The brake light runs through the turn-signal switch. 
If the switch has given up the ghost, or started to, it'll cause all kinds of strange taillight issues just like you're describing.
« Last Edit: November 30, 2014, 01:32:04 PM by hatzie »
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Parts & Illustr Books -->http://tinyurl.com/SqParts
GMSTG Textbooks-->http://tinyurl.com/STG-TEXTBK
Radio Manuals-->http://tinyurl.com/DELCORADSVC

Offline 78BIG-TEN

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Re: Brake/hazard/turn signal problems
« Reply #2 on: November 30, 2014, 02:23:45 PM »
I would check left front and rear grounds and sockets

Offline Yams

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Re: Brake/hazard/turn signal problems
« Reply #3 on: December 01, 2014, 07:46:57 PM »
ended up being the turn signal switch. what a pain to change!