Towing a Trailer with 7-Way RV Style Connector with a Semi-Truck with a Semi Style 7-Way

Question

Question:

I have a semi truck 7 pole round male do yall have an adapter to plug in to my gooseneck trailer which is 7 blade or would I have to change my trailer to 7 round female

asked by: Ellis S

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Expert Reply:

The 7-Way on a semi-truck is not the same as an RV style 7-Way and there isn't an adapter. What I recommend, instead of replacing the connector on the trailer, is to add the correct mating 7-Way on the truck.

To do that you can hardwire in a 7-Way, # HM47210. For this 7-Way the white wire is ground, yellow is left turn signal and brake lights, green is right turn signal and brake lights, brown is the tail light wire, red is auxiliary power, blue is output to electric brakes, and purple is reverse lights.

If the turn signals and brake lights are not combined on the same circuits then instead of HM47210 you will need a version that has a converter to combine the turn signals and brake lights # 22551.

expert reply by: Michael H

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Answer 1

You will first need to make sure that the new tail lights are wired the same as the old ones. There are basically 2 types of wiring systems. First there is a 2-wire system that has combined turn signals and brake lights on the same circuit/bulb. And…

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Answer 2

There isn't a plug-in style adapter for your application since the semi trucks have their brake lights separate from their turn signals. So what you'd want to do is install a 4-way first on the semi with the part #119190KIT and then convert…

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Answer 3

Hello Juan, thanks for reaching out. There are a number of factors involved when converting a semi 7-way to an RV 7-way. Semis generally use a 7-pin round pin socket, similar to #PK11720. And RV style 7-way uses blades, like #PK12706. We do not offer…

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Answer 4

We do have exactly what you are needing to tow a trailer with the standard 7-Way blade with your commercial dump. To combine the turn/brake signals from your tow vehicle you simply need to use the Roadmaster Brite-Lite Wiring Converter #RM-732. After…

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Answer 5

I am not aware of any adapter on the recreational towing market that will convert a semi truck connector to an RV style connector, but we do carry the necessary parts to equip your tractor to tow a fifth wheel trailer using the following parts: -Tail…

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Answer 6

This is a common question we get on lights like the LED Trailer Tail Light with License Bracket part #328-003-81LBM1. The original colors you have are the traditional trailer wiring code so brown=taillights, red=turn/brake and white is ground. On…

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Answer 7

You will want to find lights that match the lights you currently have on your trailer. If you have incandescent lights I recommend either staying with incandescent or swapping out all of the lights to LEDs. LED lights draw much less power, so you may…

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Answer 8

Adapter #HM47425 is designed to work with a vehicle or RV style 7-Way round pin so it would not work with the semi style 7-Way for the exact reason you mentioned; the functions are different. You could install a separate 7-Way just for travel…

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Answer 9

There are two types of lighting circuits for vehicles and trailers which are separate systems and combined systems. A separate system will have a separate wire for the brake and turn signals whereas a combined system will have a single wire for the…

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Answer 10

If the trailer is one that is pulled by a motorcycle or a trailer designed to carry a motorcycle, you will need a converter in order to convert the wiring system used by the 6-Way to a 2 wire system used by trailer lights. The converter you can use…

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Answer 11

If you need to keep the 7-Way semi active on the truck then you would need to make an adapter to get it to work with an RV 7-Way. For that you would need a trailer side 7-Way round, #PK11702, a converter, #RM-732, and a vehicle side 7-Way RV style,…

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Answer 12

Either way is correct. It depends on if you want to keep the semi-style 7-Way (if you need to tow that type of trailer) or if you will never be towing a semi-trailer. If you need to keep the 7-Way semi active on the truck, then you would need to make…

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Towing a Trailer with 7-Way RV Style Connector with a Semi-Truck with a Semi Style 7-Way

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