7-Way Trailer Wiring Functions and Adding a 7-Way to a 2007 Chevy Silverado 2500 Classic

Question

Question:

2007 chevy classic silverado deisel 2500hd 4wd ext I need to know how the truck wiring is done for the trailer hookup in the back

asked by: Carter

0

Expert Reply:

I have included pictures of diagrams for both a trailer side and vehicle side 7-Way for you. A 2007 Chevy Silverado 2500 Classic would either have a 7-Way trailer connector or no trailer connector at the back. If it does not have a 7-Way the wiring should already be under the truck, normally located above the spare tire. To add the connector, you would use # HM40975 to add the connector.

If your wiring harness under the truck is a bundle of wires use # HM40975 and # PK11998. For the bundle of wires models you will have to test the wiring on the truck side with a circuit tester, # PTW2993, to determine the functions and then attach the wires by function, not color, to the back of the 7-Way using the diagram I have included. I have also linked some typical installation videos that should help.

To add a brake controller, you would use plug and play wiring harness # 3015-P. For a brake controller I recommend the P2 # 90885 that you have referenced because of its ease of use and reliability.

There may be some connections you will need to make under the hood to make everything fully functional. I have included a link to an FAQ article that should help.

expert reply by: Michael H

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click to enlarge

Answer 1

The colors that GM typically uses for their factory trailer wiring are as follows - Dark Green - Right Turn/Brake Lights Yellow - Left Turn/Brake Lights Brown - Tail Lights White - Ground Light Green - Backup Lights Blue - Electric Brakes Red/Black -…

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Answer 2

The only difference between 7-Way Utility and 7-Way RV is the color of the wires. The pin outs are the exact same so either would work just fine with the other. If you check out the picture I attached you'll see that the functions are all the…

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Answer 3

According to my research the following wires for the 7-Way on your 2019 Chevy Silverado 2500 should carry the following functions: Green OR White/Green - Reverse White - Ground Blue - Brake Controller Green OR Green/Purple - Right Turn/Stop Red/Black…

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Answer 4

I have attached a photo for you below which shows how both a vehicle side and trailer side trailer connector is typically wired. I say typically because this is not always exact and so long as the trailer and vehicle side both match it will not…

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Answer 5

Thanks for the photo, and since your Ford has TorkLift frame-mounted tie-downs that measure 41 inches to the bed, the turnbuckles you will need are going to be from TorkLift. The reason for that is there are no HappiJac turnbuckles that that amount…

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Answer 6

From what I was able to find there are several fuses associated with the tow package wiring on a 2006 Chevy Silverado. In the instrument panel on the side of the dash you should see RT TRLR ST/TRN for trailer right turn and brake signal and LT TRLR…

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Answer 7

On a trailer the brake lights and turn signals operate on the same wire/bulb. So, it is odd when the turn signals work, but the brake lights don't. There are 3 possible causes for this that are more likely than any of the other possible causes.…

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Answer 8

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 9

When wiring a 7-Way on your trailer with 5 wires, your green wire will be right turn/brake, the yellow wire will be left turn/brake, the brown wire will be the taillights, and the white wire will be the ground. You will want to find out if the blue…

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Answer 10

Since you are not getting the 12V power when your truck is running, you most likely don't have a fuse issue as you stated their isn't a specified fuse or relay in the owners manual. The issue is that your truck is computerized even at the…

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Answer 11

The auxiliary 12-volt wire that runs from the 7-way connection to 7-way trailer plug will supply 12-volt power from the vehicle to the trailer. The 12 -volt power will allow interior or exterior lights to run that are not wired in to the…

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Answer 12

In some cases trailer lighting will ground through the hitch ball but that's typically only if the actual ground circuit is insufficient. This is not an ideal setup. It needs to ground through the wiring of the trailer harness. You can test this…

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