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Why Does my 4-Way Connector Have 2 Wires Ran to One Prong for the Tail Light Circuit

Question:

my trailer has a 4 wire flat connector but there are 5 wires entering it including the white ground wire. This end plugs into a 4 wire flat connector of my 2004 Tacoma. I need to replace the trailer connector end because the wires are broken but I cant find a 4 flat connector that has 5 wires going into it. It looks like 2 of the wires go to one of the prongs and the other wires go to dedicated prongs. How can I wire this using a standard 4 flat connector on the trailer wire harness or will I have to locate a 4 flat connector that actually has five wires going in to it?

asked by: George B


Expert Reply:

It sounds like you need an Optronics wishbone wiring harness, part # A35W42B. This 4-Way has a prong that has two wires that come out of it.

The reason some 4-Ways have two wires coming out of one port is because that prong represents the tail light functions for both sides of the trailer. So one wire would run to the tail lights on one side of the trailer, and the other wire would run to the other.

I attached a video below that shows this product being installed onto a trailer and explains how the two wires from that connector work.

You could also use a standard 4-Way that has only one wire on it per prong, but you would need to splice the two wires that previously ran to one prong into one wire, and then run that wire to the tail light function port of the 4-way. If you went this route, I would recommend you get a 4-Way trailer end connector, part # 18004.

I attached an FAQ article on trailer wiring below that you should find helpful.

expert reply by: Jameson C




Products Referenced in This Question

4-Pole Trailer End Connector


4-Pole Trailer End Connector

ratingratingratingratingrating
12 reviews

18004

Retail: $6.06

Price:  $5.99

Product Summary:

Trailer Connectors
Trailer End Connector
1 Foot Long

Product Specs:

Plug and Lead
4 Flat


more information        




35 ft. Wishbone 4-Way Trailer Wiring Harness with 42" Ground Wire


35 ft. Wishbone 4-Way Trailer Wiring Harness with 42" Ground Wire

ratingratingratingratingrating
93 reviews

A35W42B

Retail: $14.95

Price:  $12.95

Product Summary:

Trailer Connectors
Trailer End Connector
35 Feet Long

Product Specs:

Plug and Lead
4 Flat


more information        





Product Page this Question was Asked From

Adapter 4 Pole to 6 Pole


Adapter 4 Pole to 6 Pole

ratingratingratingratingrating
21 reviews

30637

Retail: $27.20

Price:  $20.95

Product Summary:

Wiring Adapters
Single-Function Adapter

Product Specs:

Plug and Lead
4 Flat
6 Round


more information        







More Answers about Wiring





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