What Length Wiring Harness Is Needed For a Boat Trailer Measuring 22-1/2' From Tail Light To Tongue?

Published 06/23/2023

Products Featured in This Question

4-Flat Connector Wishbone Style - Trailer End

(37)

$22.22

40 Ft 5-Way Trailer Wiring Harness - Wishbone Style - 30" Ground - 5' Auxiliary Wire

(176)

$34.36

Question:

How do you measure to determine what Length wiring harness to buy. Example My boat Trailor is 22inch 6inch from rear light location to the tung

asked by: David M

Helpful Expert Reply:

With having 22'6" from your tail light location to the tongue on your trailer I recommend going with at least a 30' wiring harness. The additional length is needed so you will be able to route your wiring on the frame to the lights and to have enough to connect to the tow vehicle. We do have a 30', 4-Way Flat Harness # W002230 or a 40', 5-Way Harness # A40W5B depending if your boat trailer has a surge brake coupler with electric lockout. I recommend having 2' of wiring past the tongue so you will be able to connect to several different vehicles as the connector is not always right at the hitch connection. Any left over wiring can be cut off on the end but I do recommend leaving some additional length so you will not have to replace the entire harness if you end up cutting off butt connectors to replace the lights in the future.

expert reply by: Bud M