Can Brake Controller Cause the Trailer Running Lights Not to Work and Fuse Blow on 2007 GMC Sierra

Question

Question:

I bought my hitch from you guys awhile back on my then 2001 Toyota tundra. I recently bought a 2007 GMC Sierra 2500HD Classic 4x4 long bed 6.6 Diesel. I swapped over the Prodigy P2 Brake Controller from my tundra over to the Sierra and everything seems to work fine brakes, brake lights, turn lights, hazards, Except the trailer running/parking lights. I found that the fuse under the hood for trailer park was blown. When I replaced the fuse, it blew again. So I am thinking that when I spliced the P2 controller to the old adapter that was in the truck previously that I must have maybe? spliced the wrong colors? Although I matched the colors to themselves. Black=black, blue=blue, etc... I dont know just a thought? I did some research on various forums and heard that chevy/gmc made different adapters for different years so sometimes the blue and brownrunning lights are switched on the plug-in wiring harness? So do you guys offer different plug in wiring harnesses for different year 2500hds? Do you think that a new plug-in wiring harness could do the trick?

asked by: Dave H

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Expert Reply:

It might not be the brake controller that is causing the problem. It sounds like there could be a short on the trailer that is causing the fuse to blow. You will want to check the trailer wiring and make sure there are no nicks in the wiring that might have exposed wire touching the metal of the trailer frame. Also check the truck and trailer side connectors for corrosion that might be causing a short. Corrosion can also build up behind the connectors where the wires attach.

The 7-Way wiring harness that we have for the 2007 GMC Sierra Classic is # 30955. This is used either as a replacement if the factory 7-Way got damaged or to add one to a truck that did not come with a 7-Way.

For the brake controller you should be using wiring harness # 3015-P. I have included instruction and video links showing a typical installation. On the wiring harness the white wire is ground, the black wire is 12 volt power, the blue wire is output to the trailer brakes, and the red wire is input from the brake switch.

There are different brake controller wiring harnesses for different years as well as different makes and models. Your truck uses # 3015-P.

expert reply by: Michael H

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Answer 1

If you have a 7-Way on both your trailer and tow vehicle you will first want to make sure that you have a brake controller, like the Tekonsha Prodigy P3 #90195. A brake controller is what is used to send power from the tow vehicle and tells the…

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Answer 2

I took a look at the online owner's manual for your 2017 Ram 2500 and did find a couple additional fuse locations that you can check that are related to the trailer signal lights. The F11, 30 amp fuse that you mentioned changing actually looks…

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Answer 3

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 4

The Tekonsha 7-Way, RV-Style Tester for Brake Controllers #6562 doesn't always work with every brake controller we've found. There's a chance it may work on your truck but since I can't guarantee that it's hard for me to recommend…

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Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 6

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 7

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 8

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 9

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 10

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 11

Choosing the right height setting for your 5th wheel hitch is a combination of a few different variables. First of all you want your towing setup to be as level as possible. With your Montana High Country 340BH level you will want to measure from the…

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Answer 12

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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