What Parts are Need to Install a 7-Way on a 2007 Toyota Tundra

Published 02/23/2010

Products Featured in This Question

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3480)

$118.67

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus

(1402)

$22.45

Hook Probe Circuit Tester

(66)

$14.40

Question:

My brake controller is a Tekonsha Voyager. I want to connect the four wires out of the controller to the prewired Toyota harness so I am looking for a wire set that will plug into the Toyota socket and then I can splice the other ends of the wires four into the controller. A three foot length will reach the controller. If it is shorter I will need to splice extra wire on to the the controller wires. At the rear bumper I have a four wire plug that was prewired from the factory. Presumably this is for brake, tail and turn signal lights. I also have a factory wired plug with heavy gauge blue and black wires. The pigtail of which terminates into a dummy socket. I think these wire are for the electric brakes as they appear to originate from a 30 amp breaker in the fuse box near the battery and also are wired into the socket behind the left front kick panel to feed the brake controller. What I think I need is a 4 pin and 7 pin combination socket that has pigtails that will plug into the 4 wire and 2 wire sockets that are prewired at the rear of my truck. One additional factor is that the truck uses a separate amber bulb for turn signals. My RV uses a two bulb system. Will I need a converter? Sorry I didnt explain this clearly in my first inquiry.

asked by: Monte

Expert Reply:

If your truck came with a factory 4-Way connector, you will need to use part # ETBC7 to add a 7-Way at the rear of the truck. You will plug the lead off the 7-Way into your pre-existing 4-Pole. You will then have to hardwire the other 4 loose leads. White is grounded to truck frame, black is ran to the battery with the included 40amp breaker wired in line. Blue is run up to the cab on the truck and is connected to the blue wire on your brake controller. The purple wire is for reverse lights. If not needed, you can tape the wire up and out of the way.

What brake controller do you currently have and how do you have it connected. I have not heard of a 2 wire connector for brake controllers. I have added links to videos for a brake controller install on a 2008 Toyota FJ Cruiser that should be helpful.

expert reply by: Patrick B

Monte

2/23/2010

Patrick B.

2/23/2010

Now it makes more sense. If you already have a port underneath the dash for a brake controller, you should use part # 3040-P and cut off the black connector. You will then splice the wires to the loose wires on the brake controller, color for color, then plug the connector into the brake controller port. As far as I know, no one makes a plug and play harness that will attach as you have described for your Tundra. But it sounds like the wires are already run, which is the hard part. All you would have to do is splice into the black and blue wires that are run to the back. Use a circuit tester, part # PTW2993, and make sure the black wire is hot all the time. Once you have the brake controller installed, use the circuit tester to check the blue wire. Make sure it is active when the brake pedal is pushed. It may be dimly lit when the brake pedal is not pressed. If these wires are correct, all you need is 7-Way connector. Use part # 37185, it has both a 7-Way and a 4-Way connector for towing various trailers. Plug the installed 4-Way you have into the 4-Way socket lead. Connect blue to blue and black to black with the two truck wires if they check out. Ground the white wire. The purple wire is for reverse lights. If you do not need reverse lights, tape it up out of the way. You will not need an additional converter. Since you have the factory 4-Way, the converter is already in place that combines the turn and brake signals.