Wiring Wishbone Trailer Wiring Harness

Question

Question:

Trailer wire connector 4way flat/5wire, need extension to reach new truck with 7way blade ,have 7to 4 adator. Have bought 4 wire extension with only 4 wires. will everything work right

asked by: Dave

0

Expert Reply:

The 5 wire Wishbone Harness with 4-pole connector splits the running light circuit into two wires. One wire would run along the drivers side of the trailer, the other along the passenger side. Typically, the running light circuit is only carried one one wire and at the rear of the trailer, you would need to split off a wire to feed the running light on the opposite side of the trailer. The wishbone harness makes the wiring job a bit neater and eliminates the need to splice in a feed for the other running lamp.

If you purchased an extension like part # HM47115, everything will work just fine for you, assuming that everything has been wired correctly.

I have linked you to our Wiring FAQ article, which you might find helpful.

expert reply by: Mike L

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Answer 1

You have what is called a wishbone harness like #A20WB. This type of harness take the running light circuit and splits it at the trailer connector so that you do not have to run a jumper wire from one tail light to the other. The yellow/brown wire is…

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Answer 2

What you have that got damaged is a wishbone harness, and the Hopkins Endurance Quick-Fix 4-Way Connector #HM48192 will work, but you would need to combine the two running light wires and turn it into one wire. Or you could simply get a new wishbone…

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Answer 3

Your 4-pin/5-wire wiring harness is what is called a "wishbone" type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which…

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Answer 4

Typically 4-way wiring consists of 18 and 16 gauge wires. For a 4-way that has all 16 gauge wire you would want the Wesbar 4-Pole Flat Connector #W787264. The part #HM38138 uses 18 gauge for all wires but the white that uses 16 gauge.

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Answer 5

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 6

Most trailer wiring that runs to trailer lights is 16 gauge. I would rather people use 14 or 12 unless the lights are LED which draw considerably less. But for most people 16 gauge works just fine for basic trailer lighting. If you are planning on…

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Answer 7

Did you have a 4-pin connector that had 5 wires or was it a 5-pin connector? There is a big difference since you normally see a 5-pin connector on a boat trailer with the 5th pin used for an electric reverse lockout solenoid on a brake actuating…

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Answer 8

The 4-way on your trailer is what's known as a wishbone connector like part #A35W42B. Two of the wires are the running light circuit which is a little easier to install since you can run one down each side of the trailer. This way you don't…

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Answer 9

Yes, it is possible to convert your 7-way on your trailer to a 4-way. To replace the wiring on your Coleman 10 Foot pop up camper we offer wiring adapters that allow connection of different formats of trailer wiring. The best option to change the…

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Wiring Wishbone Trailer Wiring Harness

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