How To Wire a Standard 4 and 7-Way Trailer Connector On a Semi Tractor

Question

Question:

Im planning on towing a car trailer. I would like the option of having both 4 pin, and 7 blade connectors. Can you suggest a wiring kit for me?

asked by: Thomas L

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Expert Reply:

I do have an option for you but semi tractors use separate stop and turn signal circuits and they will need to be combined to tow a recreational trailer. Therefore, you will first need a converter like the Hopkins Tail Light Converter part # HM48847. Then you can wire up a trailer connector like the 7-Pole and 4-Pole Trailer Connector Sockets part # HM40975-11998 which comes with both a 4 and 7-way as well as a mounting bracket.

expert reply by: Conner L

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Answer 1

The Hopkins Tail Light Converter #HM48847 combines the signals from your truck to pass them to your towed trailer; however this won't work in reverse if you were to install this on your trailer. Since you're looking to add…

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Answer 2

The Hopkins taillight converter part #HM48847 is the current version of the 48845 that it replaced which can work for your application. It will combine the separate turn signal circuits you have on your trailer like you are needing.

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Answer 3

Since yellow, green, and black are not standard trailer taillight wires, we will need to do a little more digging to find the functions of the different wire colors. To determine the function of the trailer taillight wires, you will want to trace the…

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Answer 4

I have attached a link to all of our oval trailer lights for you. Most 6 inch oval lights are actually 6-1/2 inches long by 2-1/4 inches wide. I recommend measuring your trailer lights to make sure you choose a replacement light with the same…

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Answer 5

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 6

The problem you most likely are experiencing is due to fact that semi trucks have the turn signals and stoplight circuit on separate circuits/wires. Standard trailer wiring has the stoplight and turn signal circuits on the same wire. So in your…

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Answer 7

You can use the Pollack #PK11700 to install on your gooseneck trailer and create a 7 way plug capable of fitting on the 7 pole round plug that is on a semi tractor trailer truck. For the wiring you can use the Deka Jacketed 7 Wire #DW04914-1 which is…

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Answer 8

It sounds like you have a trailer taillight that grounds through the mounting hardware. Typically the red wire would run to the turn signal/stop light circuit and the black would run to the taillight circuit, and then the ground circuit would be…

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Answer 9

You should have 3 wires at the rear of your LED light, or from a pigtail like part #A47PB, that plugs into a light like part #STL22RB. The red wire will be connected to your stop/turn circuit on your vehicle. The black wire is spliced into your…

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Answer 10

The white wire is typically ground, you can confirm this by checking to see if it connects directly to the trailer frame. Your yellow wire is usually the left turn and brake lamp, green is right turn and brake light. The yellow/black and green/black…

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Answer 11

If you want to make a side marker light blink with the turn signal it will have to be tapped into the turn signal/brake light wire for that side. But then it will also come on with the brake lights. And you would not want to also attach it to the…

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Answer 12

Due to your 7-pin connector not having combined tail lights and brake lights you will need to create an adapter using the following parts. The Pollak Heavy-Duty, 7-Pole #PK11700 will connect to your 2012 John Deere 5045d tractor. You will wire the…

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