What is Best Way to Make Trailer Wiring Connection

Updated 10/27/2025 | Published 03/24/2025

Products Featured in This Question

7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires

(337)

$96.74

Cordless Soldering Iron

(4)

$19.38

Question:

I have a continuous 10gauge wire between the wheels with electric brakes. I want to tap into that wire and run a single 10 gauge wire to my 7 blade trailer side connector. Ground wires are grounded to frame at the wheels. Question: what’s the best type of connection /splice to tap into the cross wire connecting both wheels? I could cut and use a big wire nut to Ty all three together- probably a better way? Thanks,

asked by: Larry G

Expert Reply:

Hey Larry, the best connection you can make is to solder the connections instead of trying to use a butt end or twist connector. Nothing is more secure that soldered wire connections and since it's trailer brakes where safety is a factor I would strongly recommend soldering.

We have a cordless soldering iron with part # PTW2000 as well.

expert reply by: Jameson C

Jameson C.

10/27/2025

Hey Larry, how did the soldered connection work out for your trailer brake wiring? Your results could really help others deciding between soldering and other splice methods. Sharing what you found might guide the next person tackling the same setup.