Recommended Replacement 4-Flat Wiring Harness

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Question:

I have a trailer wire harness that i need to replace. It has 7 wires but the trailer has no trailer brakes. its a 7 wire to 4 flat 3 whites 2 browns yellow and green. do you have a replacement for this ?

asked by: Michael G

0

Expert Reply:

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 circuits to get the same signal. Depending on how much of the wiring length needs replaced, you can use the Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector, # HM38134 for a short length. If you have damage to the last few feet of your harness, and need to replace the end portion, I recommend the this Hopkins 4-Pole Flat Connector, # HM38134.

If you need/want to rewire the entire trailer from lights forward, I suggest the Hopkins Endurance Easy-Pull Harness with 4-Pole Flat Trailer Connector, # HM38136 for 25'. Or, for 30' length, Hopkins Endurance 4-Way Flat Trailer Wiring Harness, # HM48265.

Please note the linked product video below showing installation.

expert reply by: Michael R

0

Customer Image of 4-flat plug
(click to enlarge)

Answer 1

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…

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Answer 2

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 3

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…

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Answer 4

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 5

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 6

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 7

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 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

I went out to our warehouse so I could take a few measurements of the Roadmaster Replacement Swivel Collar #RM-9200-4 that you referenced. The inner hole diameter for the tube is 3/4 inches and the overall width is right at 2-1/8 inches. The pin has…

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Answer 10

I went to the warehouse and took some measurements of the Roadmaster Replacement Swivel Collar, part #RM-9200-4 for you. I have attached a photo of the collar and the measurements are noted. The hole for the pin is 1/2-inches diameter. The hole…

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Answer 11

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 12

If your trailer has 7 wires running all the way back to the brakes, then yes, you can tap into the existing wiring. Each of your new brakes will have two wires for the brake magnet. One wire is for 12 volt power to the brake magnets and the other…

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Recommended Replacement 4-Flat Wiring Harness

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