7-Way Trailer Wiring Harness Recommendation for a 2004 Chevy Silverado 2500HD

Question

Question:

Which pollack 7 pin trailer wire recepticle do I need on a 2004 Silverado 2500HD with factory tow package. The cover on my current housing broke?

asked by: Patrick G

0

Expert Reply:

For a replacement 7-way confirmed to fit your 2004 Chevy Silverado 2500HD we have the part # 74682 which is a fit that also has a 4-way on the side of the 7-way.

I attached an install video for this connector for you to check out as well.

expert reply by: Jameson C

0

Answer 1

On some vehicles, the key has to be on for voltage to go back to the trailer connector. On others, it does not. An electric brake controller will always send back some minimal voltage to the trailer connector. This is how it senses if there is a…

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Answer 2

No worries. What you describe sounds like the classic case of a bad ground. Because vehicle headlights use a fair bit of power and remain on continuously (rather than blink) they often are the lighting function that causes a weak ground connection…

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Answer 3

See the picture to the right for a wiring diagram of seven-way vehicle end trailer connector. If you click on it you can enlarge it. I have also included a trailer wiring FAQ page for you to check out.

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Answer 4

Most likely the issue you're having with your trailer lights not functioning is due to a weak ground. The tester you use on the truck's socket does not draw much power at all, nowhere near the current drawn by the actual trailer lights when…

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Answer 5

On your 2004 Chevrolet Silverado 2500 the factory wires should be light green, dark green, blue, yellow, red, brown, and black. The functions of those wires should be as follows: light green - reverse lights dark green - right turn/brake blue -…

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Answer 6

When hardwiring a 7-Way to your 2005 Chevrolet Silverado, like part #PK12-707E, you will want to connect the following functions to the following pin locations: 1 o'clock - 12V Power 3 o'clock - Right Turn/Stop 5 o'clock - Brake…

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Answer 7

You have some wiring shorts that need to be cleaned up. It sounds like your best option is to go over all of the trailer wiring on the truck. I'd suspect that if you inspected the back of the trailer wiring connector you'd see quite a bit of…

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Answer 8

That is a pretty odd issue. Since the fuses look good, and you do not see any obvious issues with the wiring I would check that there is no corrosion causing power to jump from the 12v power pin to the other pins, as this would be the most likely…

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Answer 9

This sounds like a ground problem on the right side. The turn signal not working makes sense because with the brake lights, there is a constant signal coming through which is enough to make the lights illuminate on both sides like they should. But…

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Answer 10

It sounds like you may have a loose wiring connection or a corrosion problem on the 7-way pin for the right turn/brake lights. This pin is the one at the 3-o-clock position as you're looking at the vehicle's 7-way; please refer to the linked…

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Answer 11

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 12

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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