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Semi Trailer Light Function Locations on Heavy Duty 7-Way Pin Connection  

Question:

What pin on the plug brings power to the marker lights on the back of the semi trailer? Thanks

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Expert Reply:

On a 7 pin round which is the common connection on a semi trailer, the clearance/marker lights are at the 10 o clock position when you look at the trailer wiring connection. When looking at the connector on the back of the truck, that will put the same function at the 2 o'clock position pin.

I've attached a photo of each to assist.

expert reply by:
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Jason S
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