Recommended 5-Way Adapter for Vehicle 4-Way Trailer Connector Wiring Harness to Work With Trailer

Published 12/08/2017

Products Featured in This Question

Curt Trailer Connector Adapter - 4-Way Flat to 5-Way Flat - Vehicle End

(103)

$17.00

Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter

(262)

$16.23

35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground

(847)

$23.05

Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48"

(138)

$9.95

Question:

My wiring on my trailer is 4 way but it has 5 wire how do I connect it to a 4 way with 4 wire. Color wire is white,brown,yellow/brown,yellow,green.

asked by: Jerry

Expert Reply:

For your trailer with 5-way flat connector to connect to your vehicle 4-way flat, I recommend the Curt Trailer Connector Adapter - 4-Way Flat to 5-Way Flat - Vehicle End # C57187 or the Tow Ready # 20036. The blue wire will connect to your reverse light wire at your tail light utilizing the quick connect supplied with this adapter.

expert reply by: Jason S

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Jerry

12/8/2017

My wiring on my trailer is 4 way but it has 5 wire how do I connect it to a 4 way with 4 wire. Color wire is white,brown,yellow/brown,yellow,green.

Jason S.

12/8/2017

It is likely that the brown and yellow brown are both running light circuits with one run to each side of the trailer. They call this a wishbone harness like # A35W42B because it makes that running light wire split at the connector instead of running a jump wire from one side of the trailer frame to the other at the light location. Check the functions using a battery to isolate function and location to confirm because the colors aren't a perfect match. I've attached an article to assist. If this is the case, you can simply splice the 5 wires into a 4 wire connector like the Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48" # HM38134. If that 5th wire on your trailer activates a reverse light, then you have a 5-way and will need to add the adapter # 20036.