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Thread: trailer light issues
07-30-2012, 09:00 PM #11
Some trucks (like I said, don"t recall the Silverado), have separated sig and brake circuits (quite sure the Serria is separate, I remember the sigs being amber). One of the jobs of the flasher is to output these two leads into one for the trailer connector.
Try a new flasher, that will probably solve the problem.Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
07-30-2012, 11:35 PM #12
I would suggest before you replace the flasher unit that you take a look at the junction box at the rear of the truck. Sometimes they can get corrosion/moisture. Follow the wiring for your trailer plug (and tail lights, etc.) to a box where all of the harnesses for the rear lights meet and a main harness from the front of the truck goes in. Unplug everything, take the junction box off and make sure everything is OK inside of it. If not, then check your flasher. I had to replace the flasher on my Avalanche due to it making the right side trailer signal work, but not the brake light on that side.
2001 Silverado Reg. Cab Not-So-Base -- SOLD
2003 Avalanche Z71. No Cladding. Check out my Mod thread.
1974 Triumph Spitfire 1500 - Work in Progress
2003 Sierra 3500 Duramax. The Newer, Better Work Truck
07-31-2012, 11:51 AM #13
I'm at work now so I can't get to the truck, but are u referring to the junction on The rear crossmember where the blue harness plugs in and splits to the taillights and markers cause the trailer wiring doesn't connect to it. Or is there another junction that you are talking about??Don't Run Your Fingers Over My Truck And I Promise Not To Run My Truck Over Your Fingers!!!
08-05-2012, 07:46 PM #14
Thanks to all I did figure out it was th flasher unit causing the problems. I got lucky napa had them for $29 where everyone else wanted $75!
08-06-2012, 05:43 PM #15
08-06-2012, 06:04 PM #16
Thanks for letting us know what the fix was. I am curious, did the truck lights work OK but just not the trailer?2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
08-07-2012, 11:54 AM #17
The trailer lights did the following right tail light was constant on, the left signal acted like hazard flaahers and right turn signal didn't. Work at all. On the truck every now and then the left turn signal acted like the hazards. But it only did that when cold
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