AboutCAJUNSC/RAMBLER390 Expertise 1998 and NEWER questions ONLY!! I WILL REJECT QUESTIONS FROM 1998 BACK. Electrical diagnosis. Brake Diagnosis. Driveability, Service Engine Soon Lights. Some Engine mechanical. Tires and wheels. ABS. HVAC. Air Bag (SIR). Interior, seats, etc... 6.6L Duramax Diesel diagnosis. 6.5L diesel diagnosis. I WILL not answer Alignment questions OR carburetor questions. No heavy internal transmission
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Experience 18 Years GM Dealership experience as an "A" line tech. ASE MasterTechnician. 100% GM certified MTC Certified.
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Expert: CAJUNSC/RAMBLER390 Date: 1/8/2008 Subject: 1999 GMC Sierra trailer plug
Question We have a factory installed trailer plug. When we hooked up our trailer it worked good. After a year just the right side works. Checked fused and replaced the one on the left side. Now it works but when it works their is a trickle of light on the other side. We think it is a short. Could you please give advise on how to find this short. Thank you for any advice. Cathy
Answer Hi
I would almost be CERTIAN it is NOT a short but a faulty ground.
If you use a test light and test the plug left circuit and ground.
If the light "flicker" like you describe it is a problem with the truck's ground circuit.
It it DOES NOT flicker, it is the trailer wiring, which I would HIGHLY suspect, as the SAME ground circuit is used by the plug.
I Hope this helps
Pawl
