Connecting of 7 Way Wiring Harness On 2005 Chevy Express Van To 7 Way Trailer Connector

Question

Question:

presently have 7 wires with inline connectors crimped on and taped, inside the left rear frame where the owners manual said they would be. need to connect these to a seven wire outlet on rear bumper. Need to know the color code. can you help.

asked by: Phil Y

0

Expert Reply:

On your 2005 Chevrolet Express Van with the 7-wire trailer harness you will need to use a circuit tester like the # PTW2993 and test the function of each wire to know where to connect to the 7-wire outlet. I am sending a link with a picture of a 7-way vehicle connector that shows the connections for each specific function.

If you need a trailer connector for your vehicle, I have the Hopkins Adapter 4 Pole to 7 Pole and 4 Pole, # 37185, which can be used to connect to the 7-wire trailer harness you have. If you do not have the 4-pole connector on your harness, you can just cut the 4 poles off of the adapter and wire each one accordingly. Our Hopkins Adapter, # 37185, has a yellow wire in place of the purple wire that is used as an auxiliary wire, like reverse lights, if needed.

expert reply by: Jeff D

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click to enlarge

Answer 1

Attempting to wire a 4 pole like the #18002 into the taillight system of your 1999 Express won't work, as you've found. The 1999 Express uses what is referred to as a separate or a 3 wire taillight system, where the running lights,…

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Answer 2

The Timbren kit you need for your 2001 Ford F-250 4x4 is the part #TFR250SDE which I attached a link to the install instructions plus a link to a video that shows our installers installing the kit on a 2002 Ford F-250 just like yours.

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Answer 3

On the Buyers Products hitch, part #3371801102, the mounting holes are 38-3/8 inches across center on center. Then on each side starting with the hole that's towards the rear of the vehicle they measure 3-11/16 inches from the first to the…

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Answer 4

Trailer brake controllers cannot work as supplemental braking to apply the brakes of a vehicle being flat towed. You'll have to go with an actual supplemental braking unit. The easiest system to set up and use is the Blue Ox Patriot…

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Answer 5

You have to wire a separate 12 volt power wire for the 7-way adapter as it would draw considerably more than what the power wire of your 4-way kit is capable of. The 4-way's power wire will be in use at all times so you couldn't swap…

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Answer 6

Thanks for the photo and let's start with the correct 4-way for your 2020 Chevy Express 2500, which is the T-One Vehicle Wiring Harness #118392. As you can see by the cut out of the linked installation instructions I added, you will connect the…

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Answer 7

For the 2019 Chevy Express Van 2500 without a towing package, you will need the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part #118392 which will give you a 4-pole to start with if you don't already have one. Then…

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Answer 8

If your 2019 Chevy Express Van does not have any trailer wiring or a hitch there's a strong chance you don't have it but you can verify this by checking the VIN with a Chevy dealer. So for trailer wiring you'd want to start with the 4-way…

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Answer 9

The Buyers Products #337B1018LSP do not come with any mounting hardware, since the method of mounting is going to vary from vehicle to vehicle. Ideally you will use the factory fasteners on your vehicle to secure it into place and locally sourced…

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Answer 10

I cannot confirm what the harness you have pictured is for. However, it is not a trailer wiring harness. If you'd like to add a 4-way to your 2019 Chevrolet Express Van (assuming you don't have the factory tow package, of course), then you…

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Answer 11

For your 2019 Chevy Express Van I recommend going with the Tekonsha Prodigy P3 #90195 brake controller. This is a great brake controller that applies the brakes on your trailer at the same time and with the same intensity as the brakes on your van.…

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Answer 12

On the Hopkins Plug-N-Tow Wiring Harness, part #31345, for the 2003 Chevrolet Express, the powered converter is used to supply the power to the trailer lights by being connected directly to the vehicles battery. When drawing the power directly from…

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