Hey Bill, the minimum wire size for a 7-way trailer plug is going to be 16 gauge for the turn signals, brake lights, reverse lights, and running light wires, and the suggested minimum for the ground, brake power, and battery hot lead wires is 12 gauge.
So the TorkLift Wiring Harness Extension for 24" SuperTruss Hitch Extender # TLW6024 is going to be a mix of both 16 AWG and 12 AWG. This is going to be pretty much standard across the board no matter what brand you choose to go with.
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