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Chevrolet Suburban and Tahoe Towing Questions

39 messages,  Last post on Dec 01, 2009 at 4:59 PM

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#37 of 39 2004 Tahoe Trailer Wiring Problems by rwag1945 Sep 05, 2009 (9:25 am)
I have a 2004 Chevy Tahoe, which apparently has a wiring harness problem. I have two trailers, both with new wiring harnesses and light assemblies.   ALL Tahoe lights work fine without a trailer connected. Trailers have good grounds.   The Tahoe plug at the back tests “good” on all connections UNTIL the trailer is plugged in. Then the lights go crazy. The Tahoe ground then tests “hot” Tahoe lights: none on trailer Brakes lights: none on trailer Left Directional: good on trailer and Tahoe Right Directional: none on trailer; Tahoe works, but both tail lights come on Brake & left directional: Trailer has left directional; no brakes; Tahoe ok Brake & right directional: Trailer has LEFT directional; no brakes; Tahoe ok Lights & left directional: Trailer has left directional; no tail lights; Tahoe ok Lights & right directional: Trailer has no lights; Tahoe has tail lights, but right directional stays on and does not blink   Both trailers have the same performance. The Tahoe wiring has never been damaged or under water, and has worked fine for five years. Can it be the right tail light module on the Tahoe? Wiring harness? Replies to this message: kiawah (Sep 05, 2009 10:21 am)
#38 of 39 Re: 2004 Tahoe Trailer Wiring Problems [rwag1945] by kiawah Sep 05, 2009 (10:21 am)
Replying to: rwag1945 (Sep 05, 2009 9:25 am) You have too many variables to solve, the way you are testing.   First, I would eliminate any trailer issues (mis-wiring, bulbs, or grounds) as possibly being the problem. To do this, you need to have a separate source of power to manually test it out (don't use the Tahoe trailer connector). You can use either a standalong battery, or build yourself a test power source with a cigarette lighter plug, some wire, and a couple alligator clips.   Powering from the cigarette lighter, connect to the different wires of the trailer and verify that each one is working exactly as it is supposed to. Verify that the correct filament of the bulbs (if you have the assemblies which use dual filaments) are lighting. The bright filament when a brake/turn is powered, the dim filament when the running lights are on. Verify also that you don't have any bulbs where the filaments are broken and crossed over onto the other filament. This will also verify that you ground back to the bulbs is good as well. Only after you are absolutely certain that the trailer is wired and working correctly, do I plug into the back trailer connector.   It is much easier to troubleshoot trailer wiring issues this way. In the first steps you eliminate the truck from being the source of any problems, until you absolutely are sure the trailer is correct. This then eliminates the trailer from being the source of the problem when you eventually connect them together...proving that you have a tahoe problem or not.
#39 of 39 99 tahoe electric trailer brake wiring by bsbladine Dec 01, 2009 (4:59 pm)
I found out that this truck has a brake stoplight connection for attaching my trailer brake control, but is there somewhere to hook up the brake wire? My truck does have the blue and red wires at the light hook up. Any ideas?   Thanks

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