Parts Needed to Rewire a Trailer w/ Electric Brakes
Updated 09/26/2025 | Published 04/16/2025
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Question:
Have a 18ft car trailer with electric brakes on both axles. Has 7 pin connector and bad wiring. Do you sell A replacement harness. The whole harness
asked by: Mike M
Expert Reply:
We sure do Mike. I recommend the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item # e99011 along with the 16 Gauge, Per Foot item # 16-4B-1 if you're replacing the lighting wire, and 12 Gauge 2 Conductor Jacketed (Brake) Wire Per Foot item # 12-2-1 for everything else.
I really like the junction box item # e99011. This provides you with one organized location where you can safely consolidate all of your trailer's wring connections. It has all of the ring terminals you'll need to make the connections inside the box. You'll also want to purchase some heat shrink butt connectors to insure you have water tight connections. You'll want item # DW05745-5 and item # DW05744-10.
I have linked an faq below that will help walk you through any questions you have when you're rewiring your trailer. Additionally, if you have any questions along the way you can always reach out in the comment box below.
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Jerred H.
9/26/2025
Hey Mike, did the etrailer Trailer Wiring 7-Way Upgrade Kit and the other wiring components work out for your trailer? I'm curious to know if the setup helped you organize and secure your trailer's connections, as it could give others confidence when tackling similar wiring projects.