How To Replace 7-Way Trailer Connector On Trailer with 5 Wires

Question

Question:

I have a 2015 Ford f-150 w/factory hitch and 7 blade plug. My trailer is a 2004 Big Tex with a 7 blade plug but only 5 wires. The plug got smashed and I can`t get my new 7 blade molded plug hooked up to 5 wires. Can you possibly help me ? Thanks

asked by: Dave M

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Expert Reply:

In order to install a 7-way trailer connector like the 7-Way Molded Trailer Wire Connector part # H20043 on a trailer with five wires, we need to know what those wires do. I can almost guarantee what four of them are; left stop/turn, right stop/turn, running lights, and ground. If the trailer has brakes then the last wire is for the brake output. If the trailer has an on-board battery then the wire is for the battery charge line. If the trailer has backup lights or an electric actuator then the wire is for the reverse circuit.

Unfortunately, you'll need to apply power to each wire to see which circuit it actives as we can't comment on wire color since all trailers don't use the same color wires.

expert reply by: Conner L

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Answer 1

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 2

There is not an adapter so you'd need to make your own for your trailer with a 5-round connector like #PK11501. What you'd need to do is cut off the end of your 4-way and connect the wires to the terminals of the 5-Pole, Round Pin Trailer…

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Answer 3

Hey Richard! Since you have a 7-way with the factory tow package I recommend the Redarc Tow-Pro Liberty Brake Controller #RED26CR. This brake controller is simple, reliable, and won't take up space in your 2019 Escalade. The main unit mounts…

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Answer 4

On a 7-Way trailer connector there should not be a 24 volt wire. But wires could come loose and make contact with other wires inside the connector and cause a short which is what sounds like happened. I recommend replacing the trailer side 7-Way with…

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Answer 5

I do have an option for you but I don't recommend using a breakaway battery for a power tongue jack. That's not what they are designed for and would not allow the jack to operate or for very long. That said, there are many variables to this…

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Answer 6

Most people will trickle charge their trailer battery through the 12-volt accessory circuit of the 7-way trailer wiring connector. You'd basically just run a wire from the 1:00 pin of the 7-way to the positive terminal of the battery #BRW37FR and…

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Answer 7

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector…

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Answer 8

Hey Rick! The Redarc Tow-Pro Liberty Brake Controller will fit your 2016 Escalade. If you have the factory tow package you need the #RED26CR which comes with a custom wiring harness. If you added an aftermarket 7-way you will need the #RED52VR which…

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Answer 9

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 10

You would not be able to charge your battery through the wiring on your 4-way trailer connector. Since your truck has a 7-way connector, you could maintain the power to the battery but not charge it. To begin, you would need to cut off your 4-way…

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Answer 11

Hey Cain, thanks for reaching out! As long as the white wire is for the ground then yes, you can add a main ground to the white wire on your 7-Way connector and that would be the way to go. If you aren't sure whether the blue or white is…

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Answer 12

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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How To Replace 7-Way Trailer Connector On Trailer with 5 Wires

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