2 Check out a step by step guide to rewiring a trailer end to end with new lights, wires, and a junction box. LOTS of pics included. Step by Step: How to Rewire a Trailer with Lights ...February 28, 2020 in DEEP THOUGHTS / FABRICATION KNOWLEDGE / FABRICATION PROJECTS / MISCELLANEOUS / TOOLS OF THE TRADE! tagged 3500 / 4 Way Plug / 7000 / Brakes / Electric / LED / Rewire / RV Plug / Tandem / Trailer / Wiring by Paul