Wiring US 4-Pole Trailer Connector to For Trailer with European 7-way

Question

Question:

I am in Germany with the Army. My American spec car has the flat 4 and my European motorcycle trailer has the round 7 pin. Can you describe more in detail the special adapter? And does anyone make one? What permanent changes should you have to do. Splice together the tail lights for beginners? Thanks!

asked by: Andy K

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Expert Reply:

I am not aware of the existence of an adapter, but one could be easily constructed.

You will need to find a vehicle-side socket to receive the plug from your trailer. We do not carry them, so you will need to obtain one locally. You will also need a vehicle to vehicle taillight converter like part # 118158 and a trailer side 4-pole like part # 18004. You would then wire the converter as shown in the diagram I provided.

Using this adapter will separate the turn signal back out so that the separate turn signals on your trailer will operate correctly.

expert reply by: Mike L

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Answer 1

No. The 7-Way end in the #47405 adapter is made for the North American style of 7-Way round pins. A European 7-Way, see picture, has separate turn signals and brake lights and a circuit for fog lamps. The tail lights are also separate. You would…

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Answer 2

U.S. 7 pins such as Pollak #PK11700 have different functionality than European style 7 pins, as the Euro style is essentially equivalent to our 4 way. What you are going to need to do is match up the wiring from both connectors; I've added a…

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Answer 3

If you wanted to prevent the 12 volt trailer wiring circuit from backfeeding when connected to your trailer's battery you'd have to use a diode like the part #RM-690. This will only allow the current to flow in one direction.

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Answer 4

Usually a brown wire contains the running light circuit. However, you cannot go by wire color because it always varies from trailer to trailer. You will want to trace the wire back to where it leads on the trailer to determine its function and then…

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Answer 5

It is possible to tow your US wired trailer with your European wired vehicle, but the solution with either be to install a new, or separate, trailer connector on your vehicle, or making an adapter from a few different parts. The main difference…

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Answer 6

There is a specific adapter for Land Rovers that have that European 7-Way connector #118710. One end plugs into the vehicle 7-Way and the other end has a connector for a 4-Way flat connector used on US trailers.

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Answer 7

Our understanding here at etrailer is that European spec trailer wiring connectors will have many more terminals than 7. However, there are some 7-way round, Euro spec connectors and I attached a diagram of how they are typically wired. What you…

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Answer 8

In order to get the US style 4-Way to work with the European style 7-Way you are going to have to do a little hardwiring. What you will need is a vehicle side European 7-Way and a special converter, #118158. You will have to cut off the 4-Way on the…

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Answer 9

If your Discover has the 7-way connector that uses the round pins like part #PK11720, we do not offer a pre-made adapter, but one can be easily constructed using a 4-pole vehicle end connector like part #18002 and a 7-way round pin trailer end…

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Answer 10

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 11

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 12

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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