4-Pole Wishbone Harness for Running Light Connection

Question

Question:

Doe the brown wire have to run to both of the rear lights? If so, do you have to tap into the brown wire near the rear of the trailer to run the brown wire to the second rear light?

asked by: Earl

0

Expert Reply:

Connecting the brown running light wire in standard 4-pole wiring to both tail lights will require a jumper wire from one side of the trailer to the other, or you can install what's called a wishbone harness that has dual brown running light wires, one for each side of the trailer.

We have several of these trailer-side 4-pole wishbones, such as 40-foot # A40W42B, 35-foot # A35W42B, 25-foot # A10-4225VP and 20-foot # A20WB.

I do recommend using a wishbone harness instead of a spliced jumper connection because avoiding splices usually means better reliability. Be sure to make your ground wire ring terminal connection to a clean bare metal spot on the trailer frame.

I also recommend applying dielectric grease # 11755 to both vehicle and trailer connectors, your grounding point, as well as on your light's bulb sockets. The grease blocks moisture and other contaminants from causing corrosion on these surfaces for more reliable operation.

expert reply by: Adam R

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Answer 1

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 2

From the image you attached, I think what you have is each of the taillight circuits on your 4-way have two wires ran to them for each side of the trailers wiring. You can wire the two wires of each pin to the single wires of a new 4-way allowing the…

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Answer 3

The standard 4 Flat will have the White (ground), Brown (running lights), Yellow (left turn and brake), and Green (right turn and brake). Black will typically be used for 12 volt power, but can also be any number of things. The only way to know for…

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Answer 4

I went out to the warehouse and pulled a 35 ft. Wishbone 4-Way Trailer Wiring Harness, #A35W42B, and used a wire gauge tool to measure the wires. The copper wire itself is 20 gauge. If you measure the wire with the insulation on it then it is thicker…

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Answer 5

What you have is a 4-way wishbone harness like part #A35W42B. It's a 4-way with two brown wires so you can run a running light circuit down each side of the trailer and not have to use a jumper wire to go from one side to the other. It makes…

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Answer 6

If you don't have brake or turn signals on the right side of your trailers then the most likely cause of this issue is just a blown fuse, F81 in the engine bay fuse box which is a yellow 20 amp. If the fuse is good then check the wiring behind…

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Answer 7

I recommend moving away from the Adapter 4-Pole to 5-Pole Trailer Wiring Adapter #47515 and going with a Buyers Products Trailer Connector Adapter #337TC1474P. The wiring and connectors used on the 4-way harness are not designed to be used with the…

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Answer 8

The Equal-i-zer Shank part #EQ90-02-4900 would be your best option to give you the amount of drop you need to tow your trailer level. The Curt shank you have now part #C17131 can do up to 2 inches of drop but the Equal-i-zer can do up to 6 inches so…

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Answer 9

It sounds like you have a classic ground issue on your trailer that is preventing proper voltage from reaching back to the tail lights. What I recommend doing is first making sure the main ground for the trailer connector is secured to a clean bare…

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Answer 10

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 11

It sounds like what you currently have on your trailer is what's known as a wishbone wiring harness. The running light circuit has two wires, one for the drivers side of the trailer, the other for the passenger side. A wishbone harness can make…

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Answer 12

You have a wishbone harness like #A20WB. This type of wiring harness splits the running light circuit at the trailer connector, so you don't have to run a jumper wire from taillight to taillight. The yellow/brown wire is the running light circuit…

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4-Pole Wishbone Harness for Running Light Connection

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