Trailer Wiring Harness Installation - 2001 Toyota Tundra 118378 Video

For your 2001 Toyota Tundra, I recommend the T-One Vehicle Wiring Harness #118378. This T-One connector will plug directly into the port located under the vehicle, which is referenced in the picture that you sent. This will provide a 4-Way connector…

If you have tested the Curt Harness #C55378 with a circuit tester on your 2001 Toyota Tundra, there should not be any signal to the plug when the vehicle has the lights off and there should be power to the lights when the vehicle is turned on. If you…

It's hard to say but there is a pretty good chance a 2001 Toyota Tundra with a factory hitch came with trailer wiring. If you needed wiring though the part #118378 is a custom fit option that would work well. This will give you a 4-way wiring…

The converter box for the Curt T-Connector Vehicle Wiring Harness part #C55378 is not available as a separate replacement part unfortunately. However, I actually recommend you take a look at the T-One Vehicle Wiring Harness part #118378 instead which…

Based on the steps you have already taken it sounds like the converter box is bad which means it will need to be replaced, not opened and serviced. The only thing I'm not sure about is what wiring you specifically have. From what I could find it…

The two wiring harness kits you referenced, Curt #C55378 and Tekonsha #118378, are both correct fits for your 2002 Toyota Tundra. Both of these kits are multi-part harnesses that include the required fuse/fuse holder and the installation of the Curt…

According to Curt, all models of the 2001 Tundra have the tow package connector located by the driver's side frame rail as shown in the provided photo. If you'd like a mounting bracket, I'd recommend #18140 that would attach to the hitch…

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

It looks like the 2002 Toyota Tundra should have an 8-pin square connector on the rear of the vehicle for the trailer wiring, and from the photo you're showing that is definitely not an 8-pin square connector; it's a 6 pin square. One of two…

The diameter of a 4.80x8 tire is 16.1 inches and the diameter of the 5.70x8 tire is 18.1 inches. The difference in overall diameter is 2 inches. You will want to make sure you have clearance for an extra 2 inches in height. The section width of the…

You have it right so far, the 4-way connector is just as you have stated. Remember that Yellow has a L in it so that is the left side brake/turn signal and green has a R in it so that is the right side brake/turn signal. The colors for wiring a 7-way…

There is not an industry standard layout for wiring the 4-Way round pin connector, but there is a layout that is most accepted. If you you are looking at the front side of the 4-Way round trailer side plug, the top left prong would be used for right…