What Wire Gauge Is The TowSmart 4-Way Flat to 4-Way Flat Trailer Wiring Harness Extension TS88QR

Question

Question:

whats the wire gauge for the 4 flat connection extension. Using a butt splice .

asked by: Allen

0

Expert Reply:

Hello Allen, thanks for reaching out. That TowSmart 4-Way Flat to 4-Way Flat Trailer Wiring Harness Extension # TS88QR uses 18-gauge bonded wire across all four circuits.

That’s pretty standard for 4-flat trailer wiring, because those circuits are only running lights, not heavy loads. It’s more than enough for brake lights, turn signals, and taillights, and you’ll see that same 18-ga spec on most pre-made 4-flat harnesses and extensions.

expert reply by: Jesse M

0

TowSmart 4-Way Flat to 4-Way Flat Trailer Wiring Harness Extension Kit - 18" Long
(click to enlarge)

Paul W.

5/5/2026

I got it to extend the wiring of rental equipment Works great

Jesse M.

5/5/2026

@PaulW Nice! Glad to hear it worked out. Thanks for sharing!

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What Wire Gauge Is The TowSmart 4-Way Flat to 4-Way Flat Trailer Wiring Harness Extension TS88QR

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