1983 Chevy Truck Possible short in left rear turnsignal/bre

RDGLDR1

MEMBER
1983 CHEVROLET TRUCK
V8
2WD
AUTOMATIC
136,000 MILES

I have tested the socket for my left rear turn signal/break light/running lights "1157 bulb". The bulb itself is good, I read 12volts to ground on brown wire "running light" and intermittent signal on the yellow wire. I assume there is a short in the line from somewhere from the steering column to the socket. I have stripped wire bare and tested just outside the socket to make sure it wasn't the socket itself. Any suggestions to where I should concentrate?

3 Replies

JDL

MECHANIC
16,098 POSTS

With turn signal on, there would be a pulse on yellow wire. Maybe I didn't understand your question? There shouldn't be any voltage on the brown wire unless the headlamp switch is turned on. With a faulty ground, the turn signal might try to use the brown wire for ground?

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Sunday, August 15th, 2010 AT 3:10 PM

RDGLDR1

MEMBER
2 POSTS

I checked the brown wire to ground to make sure there was no fault in the socket with parking lights on.

I checked the yellow wire both with brake pedal and turn signal on. I would get a reading of 1.5 volts before it would go to zero but no steady reading. I checked the brake light because I knew it would be a steady voltage with no flash because it runs on the same yellow line.

Since the yellow line is tied to both the break switch and the turn signal/flasher relay there is a short after leaving the flasher. My front flasher works, but read doesn't.

I was asking if there would be a possible place to look for short without having to tear out whole line or should I just run a new line for the yellow wire after the flasher relay.

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Sunday, August 15th, 2010 AT 8:23 PM

JDL