Question about 1985 GMC S-15
Check the ground wire that comes off the negative terminal that hooks to the core support right by the front headlight and battery. mine did something similar
Posted on Jan 23, 2014
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Posted on Jan 02, 2017
SOURCE: 2003 denali trailer wiring
If your signals & brakes are on 2 different circuits, ( for example a red lens for stop & an Amber for turn.) then you'll need to buy a converter that goes between vehicle & trailer. They're not too expensive at any trailer or RV place. I think some of the autoparts stores stock them now too.
Posted on Nov 29, 2008
This may sound too simple, but first verify that you are getting voltage to the light socket. Use meter on d.c. If you are getting voltage, and your bulb is good, it could be a bad ground. Don't overlook the brake light system goes through the directional signal in the steering column.
Posted on Feb 20, 2009
You have a short to ground somewhere in the drl-fog lamp circuit. Check for obvious wiring connector or wiring to drl & fog lamps. check wiring for pinched or broken wires coming from sockets. If you don't find problem, you can trace wiring from lamps to main harnesses and hopefully find source of short.
hope this helps.
Posted on Mar 02, 2010
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