The following file contains detail information regarding the 2007 Toyota Tundra Trailer Wire Harness installation instruction, wiring harness and wiring diagram. This covers such items as: Vehicle Protection (use of covers and blankets, cleaning chemicals, etc.); Safety (eye protection, rechecking torque procedure, etc.); Vehicle Disassembly/ Reassembly (panel removal, part storage, etc.); Electrical Component Disassembly/Reassembly (battery disconnection, connector removal, etc.).
Get detail information of the 2007 Toyota Tundra Trailer Wiring Harness here (31 pages of PDF file, source: trdsparks.com)