Troubleshooting 7-Way to Semi 7-Way Adapter Stoplights Not Working

Question

Question:

I bought the 7 pin adapter to go from 7 pin round on my semi to the 7 pin flat . Everything works except the brake lights. I havent hooked up a brake controller yet . Is that needed to make the brake lights work . Thanks for any help .

asked by: Lee

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Expert Reply:

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 situation you would need to wire in the Hopkins Tail Light Converter part # HM48847 on just the stoplight and turn signal circuits and you'll be good.

A brake controller would not affect the stoplight circuit at all.

expert reply by: Jameson C

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Answer 1

I have attached a diagram that shows the pin designations for the 7-Pole Round to 7-Pole Flat Trailer Connector Adapter, #HM47425. I labeled the pins as they relate to the RV side 7-way blade connector. The 7-way round pin connectors typically have…

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Answer 2

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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Answer 3

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…

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Answer 4

If you are trying to install trailer tail lights on a pickup then you'll need a converter box since the pickup uses separate signals and the trailer lights are combined. I recommend the Hopkins Tail Light Converter part #HM48847. I…

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Answer 5

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…

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Answer 6

The wiring for the 7-Pin connector is different than the 7-Way blade connector. You will need an adapter to make the two different styles compatible. You can use the Adapter 7 Way (Blade) to 7 Way (Round Pin), #47595. The blade end plugs into the…

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Answer 7

I attached a diagram that shows a heavy duty 7-way pin out like the part #PK11700 that you referenced (diagrams on right of pic). The 12 volt circuit is normally in the center pin, and the ground is normally the top one. The colors aren't…

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Answer 8

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 9

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 10

It sounds like you are looking to separate out your combined brake and turn signals on your trailer, and there is a part which will allow you to do that, though it isn't an adapter. What you will need is to wire in a 2-to-3 converter, and…

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Answer 11

Since your semi trailer brake lights are working but the tractor's brake lights are not working, it sounds like the wiring for the trailer lighting is independent of the tractor's brake lights. If all of the trailer lights operate as…

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Answer 12

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…

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Troubleshooting 7-Way to Semi 7-Way Adapter Stoplights Not Working

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