No Accessory Power At 7-Way Connector On A 2007 Chevrolet Silverado Classic

Question

Question:

I need to know why my accessory power doesn't work on my 07 silverado classic HD trailer hitch. I've installed a brake controller. Now I need lights inside.

asked by: Shaun M

0

Expert Reply:

I would check the power distribution box under the hood of your 2007 Chevy Silverado Classic. The box is located on the inside of the drivers side fender. Remove the cover, and locate the two auxiliary power posts on the inboard side of the box.

If you have the factory 7-way on your vehicle, the power posts should have wires connected to them that will give you power for the brake controller and power for the 7-way connector at the rear of your vehicle. These power posts will also have fuses located next to them.

The post closest to the rear of the vehicle should have a red wire attached to it. Next to this post in the fuse box, there should be a green 30 amp fuse installed. If the fuse is not installed or is blown, or this red wire is not attached, the brake controller will not get power.

The other post towards the front of the vehicle should have a black wire that is connected. This wire will run to the 7-way connector at the rear of your vehicle and supply the power lead for your 7-way connector. It will have a 40 amp fuse located right next to the post, check to make sure that the fuse is installed and is not blown.

If there is no power wire connected to the front power post you can run a 10 gauge power wire # 10-1-1, from the 7-way connector on the rear of your vehicle to the front power post and make sure you have a 40 amp fuse installed next to the post.

Also, if you are trying to wire the center pole of your 7-way as an auxiliary power connection you can run a 10 gauge wire # 10-1-1, to the vehicles battery through a 40 amp circuit breaker, part # PK54540.

I am including a link to a FAQ page on wiring for a brake controller and 7-way wiring on your 2007 Chevrolet Silverado Classic. This page will show the wiring connections under the hood.

expert reply by: Jeff D

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Answer 1

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…

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Answer 2

The best spot to install the Trailer Connector is on the bed sidewall on the drivers side, between the wheel well and the tail gate. We have an installation video showing this Curt 5th Wheel and Gooseneck Wiring Harness #C56000 being installed on a…

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Answer 3

Some trucks do need an under-the-hood connection of wiring to activate the 12V trailer power feed and the trailer brake controller power input feed. This process is outlined and illustrated in the linked article, in the section titled…

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Answer 4

It sounds like you're looking for the fuse that controls the 12v power to your 7 way connector. The fuse for the 12v power on a 2007 Chevy Silverado (New Body Style) is located at the front of the power distribution box under the hood of the…

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Answer 5

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 6

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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Answer 7

Your trailer's brakes will not lock up from the battery in a breakaway kit, like the Hopkins Brake Master #HM20001 being dead. If the breakaway battery is dead there won't be any power supplied from the system and it wouldn't have any…

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Answer 8

If your 2007 Chevy Silverado is the new body style then you will need to make sure that the blue brake controller wire is connected to the dark blue tow package wire. The tow package wire bundle is up under the dash and to the left of the steering…

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Answer 9

I can certainly help you with that. Since the Curt T-Connector Vehicle Wiring Harness, part #C55384 is a 4-way connector the four functions will be Yellow for the left turn and brake, Green is for right turn and brake, Brown is for running lights,…

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Answer 10

Did you have a 4-pin connector that had 5 wires or was it a 5-pin connector? There is a big difference since you normally see a 5-pin connector on a boat trailer with the 5th pin used for an electric reverse lockout solenoid on a brake actuating…

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Answer 11

The 5-way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer…

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Answer 12

We do have a solution for you, however, you will not be able to power reverse lights on a trailer with a 4-pin trailer connector. The reverse lights on a trailer must receive power from the reverse lights on the tow vehicle. To do this, you will want…

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