No Power to the Brake Controller Wires Under the Dash on 2010 Chevrolet Silverado  

Question:

Expert Reply:

General Motors quit offering the plug-in type connectors on 2007 and newer full size trucks and SUVs with a factory tow package. These models have four (possibly five) blunt cut wires under the left side of the instrument panel to the left of the steering column. The wires can be identified by a white label and the color of the wires. The wire colors are (1) Red/Black wire, (1) White wire, (1) Light Blue/White wire and (1) Dark Blue wire and possibly (1) Orange wire.

There are two wires under the hood of the vehicle that have to be connected to make the tow package functional, one is the power wire to the brake control and the other is the battery charge line to the 7 way connector. These wires are both Red/Black with eyelets on them. They are coiled up under the hood and will need to be connected to the under hood fuse box. One of the wires is located between the under hood fuse box and the left (driver) side fender. The other is located under the master cylinder/brake booster assembly.

The battery charge wire and the power wire to the brake control have different size eyelets on them and will connect to the threaded studs under the gray handle at the front of the fuse box. The two studs are also different size. Be careful NOT to raise the gray handle on the front of the fuse box more than 3/8 of an inch. If it is raised higher the fuse box can become disconnected from the electrical connection and you will have to go to the GM dealer for repairs.

General Motors does not supply the attaching nut required to secure the wires to the studs. These can be obtained locally or we have them available. You will need (1) M6 x 1.0 nut, part # 185916, and (1) M8 x 1.25 nut, part # 185917.

I am including a link to a FAQ page that will describe the connections and show pictures of the wires on the vehicle.

expert reply by: Jeff D

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