Last post on Apr 17, 2012 at 3:59 PM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 1500 Classic, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Towing, Truck
#1 of 303 tow package wiring trouble
Jan 05, 2007 (8:16 pm)
I have a 2004 chevy silverado and I'm having trouble with the wiring for my tow package. When I turn off my truck I am still getting power running to my park lights on the left side of the trailer, but not all the lights on the left light up just 3 on the left brake and two on the top brake light on the back of the trailer. Also I am having problems with the left blinker not working on the trailer off and on... I've replaced all the fuse under the hood and in the dash for the trailer and even for the truck.. I've replace the ground wire to the trailer and cleaned the ball to insure a good ground and nothing has worked.if anyone could help I would sure apprreciate it...
#2 of 303 Re: tow package wiring trouble [swift1069]
Jan 05, 2007 (9:59 pm)
You should recheck all of your wiring connections. Use a 12v test light to check the wiring at the electrical connector without the trailer wiring connected. This will also help you verify which wires are for brake lights, turn signals, park lights, ect.
This test should tell you if the problem is in the truck wiring or the trailer wiring. The ground goes through the electrical connector and not the trailer ball. Some trailer wiring packages have a 12V supply wire that is hot all the time and is not tied to the ignition switch. Make sure you didn't hook the lighting into that supply wire by mistake. Sounds to me like you either have a bad connection or the wiring is incorrect.
#3 of 303 Re: tow package wiring trouble [gmctruck]
Jan 05, 2007 (10:05 pm)
The wiring in the truck came from factory and was working perfect up to a month ago... I've hooked the trailer up the my other truck and it works perfect no problems and I've tested the plug on the 04 with the problems and the running light wire has a constant power to it with everything off in the truck.. I pulled the fuse for the wire and the power is gone. I replaced the fuse and still have the same problem...
#4 of 303 Re: tow package wiring trouble [swift1069]
Jan 05, 2007 (10:33 pm)
The fuse only protects the circuit from excess current flowing through the wire and will open if the specified current rating limit is exceeded. You could still have a bad connection in the factory wiring or the wiring harness could have been pinched or damaged. Double check the ground wire connections to the chassis for loose connections or corrosion. Which fuse are you pulling that kills power to the wire? What other things does that fuse or circuit feed?
#5 of 303 Re: tow package wiring trouble [gmctruck]
Jan 06, 2007 (8:32 pm)
I am pulling the fuse for the running lights to the tow package wire. From what the book says it controls the left blinker on the truck too. But I am not having any lights on the truck staying on or even any problems with the lights on the truck.. I am sure it's something to do with the running lights wire on the tow package harness. Today I am the left brake light stopped working on the trailer too, and the other problem is still continueing. So I connect my second truck to the trailer today and everything is still working perfect on that truck. So I'm thinking the only thing I can do is to take it to a shop and have the wiring tested and maybe replaced..
#6 of 303 To fuse or not to fuse, that is the question
Jan 17, 2007 (11:13 am)
Hi, I have a 2006 Silverado and have just installed the trailer brake wiring harness and my electric brake controller. My question is: when is it necessary to install the included fuse? I had been told on earlier Silverados that the fuse did not need to be installed. The tag on the pigtail makes it as clear as mud. I don't presently have an auxiliary battery, but what if I add one such as on a battery mounted on a trailer for a winch? Thanks
#7 of 303 Re: To fuse or not to fuse, that is the question [04cad]
Jan 17, 2007 (5:16 pm)
I have a 03 2500HD to tow my 5th wheel. When I installed the break controler, I did not instal a fuse. Been towing for almost 3 years without any problems.
#8 of 303 Re: To fuse or not to fuse, that is the question [gbrewer]
Jan 24, 2007 (10:21 pm)
I have a 2002 no fuse no problem.
#9 of 303 trailer braker wiring harness
May 05, 2007 (7:53 am)
I have a 2001 silverado with the tow package. supposedly that has an electric brake wiring harness behind the instrument panel. does anyone know where this is?
#10 of 303 Trailer connector fuse?
Mar 25, 2007 (1:16 pm)