Installing 7-Way Trailer Connector and Brake Controller On 2003 Chevy Blazer

Expert Reply:

To install a 7-Way blade style RV connector and brake controller on your 2003 Chevrolet Blazer, you will need to install the Brake Controller 7 and 4 Way Installation Kit, part # ETBC7.

To begin, since there is not a factory 4-way on your truck, you will want to just cut the 4-way connector off that is connected to part # ETBC7. Those wires will need to be spliced into the correct wires on your vehicle, you will want to use a circuit tester, part # 3808 to test functions of the wires. The Green wire on the 4-way right turn and brake and should connect to vehicle wire that carries right turn function.

The Yellow wire is left turn and brake, should connect to the wire that carries left turn function. The Brown wire is tail lights, and should connect to wire that carries running light function.

Then connect the remaining wires on the ETBC7, the Black wire will be connected to the Black wire inside the Jacketed 2 Wire and ran to the front of vehicle and connected to the battery via 40 amp circuit breaker, part # PK54540. The Blue wire will be connected to the White wire inside the Jacketed 2 Wire, and ran to the front of the vehicle and later will be connected to the brake controller.

The White wire is the ground and should be connected to the frame of vehicle. The Purple wire can be connected to the reverse lights if the trailer has reverse lights or can be taped off and tied out of the way if not being used.

For a brake controller, if you do not already have one, I would recommend the Tekonsha Prodigy P2 Brake Controller, part # 90885, which is a proportional brake controller, that sends power to the trailer brakes in proportion to brake force applied to your vehicle.

To wire the brake controller, the wires on the back of the brake controller will need to be ran. The White wire will be connected to the negative battery terminal. The Black wire will be connected to the positive battery terminal via 30 amp circuit breaker. The Blue wire will connect to the White wire in the duplex cable that you ran up earlier.

The Red wire will be connected to the stoplight switch near the brake pedal. The stoplight switch will be the wire that only carries a signal when the brake pedal is pressed. You will want to use a circuit tester, part # 3808, to test for this wire. If you have trouble finding the stoplight switch wire, you can splice into the Center High-Mount Stoplight wire.

I have linked FAQ Articles on Wiring and Brake Controllers that you may find as a good reference. I have also linked an FAQ Article on installing the Brake Controller 7 and 4 Way Installation Kit, part # ETBC7.

expert reply by: Reno H