Review of Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C55378 Video

I do have a solution for you. In order to add a 7-Way wiring harness to your 2001 Toyota Tundra, you will need to start by adding a 4-Way, #118378, if you need one. I have included a link to the installation instructions for this harness for you to…

The VIN doesn't give me really any information beyond what you already gave so I reached out to the manufacturer. You have the 3,700 lb axle, but it has the standard 3,500 lb spindle size based on the bearing numbers they gave me for your axle. I…

Since the Hopkins 7 and 4-Way trailer connector #HM40975-11998 includes a hardwire harness it technically could be installed on any vehicle, including your 2002 Toyota Tundra with a 4-Way connector. But you will need to do some hardwiring and extra…

On the 4-pole trailer wiring harnesses we offer for your 2000 Toyota Tundra, Tow Ready #118367 and Curt #C55367, the connection point is under the vehicle on the driver's side. There will be a connector to mate with the plug shown in the linked…

I think you are going in the right direction. I would definitely replace the 14 gauge wire going to the trailer brake magnets with 10 gauge wire or larger. Usually larger than 10 gauge is hard to get into the trailer connector though. I would also…

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…

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…

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 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…

Thank you for the photo of your 2002 Tundra's wiring connector. We do not offer any auto maker's OEM-style connectors by themselves, only as part of wiring harness products like T-One Vehicle Wiring Harness #118378. The photo I linked shows…