Eaton Fuller TCM Jumper Harnesses

Bench-testing Eaton Fuller TCMs off the vehicle is essential during transmission conversions or engine swaps—confirming function early prevents in-truck troubleshooting, codes, or failures when pairing a new powertrain with an automated Eaton transmission. Kustom Truck Parts' Eaton Fuller TCM jumper harnesses (specifically the TCM adapter) connect directly to our base bench harness, providing the correct pinout for accurate diagnostics and programming.

This precision-wired adapter ensures reliable connections for safe, off-vehicle TCM verification—perfect when upgrading to or integrating Eaton Fuller automated transmissions (e.g., Ultrashift Plus) in Kenworth, Peterbilt, or similar chassis.

Browse below for Eaton Fuller TCM harness options. Pair with our base bench harness and battery jumper for a complete testing setup. Need help confirming compatibility with your Ultrashift model or conversion needs? Contact our team—we're here to support your build.