How to Access +12V Power Circuit in 7-Way Wiring to Power Fuel Pump

Question:

Do they make a adapter to activate the power supply so i can plug in my pump on my diesel fuel tank

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Expert Reply:

7-way trailer wiring includes a +12V auxiliary power circuit that can be used for a range of purposes from powering an electric jack to topping off a trailer-mounted battery. This circuit is handled by the contact at the 1:00 position as you look at the vehicle's trailer socket. The ground is at the opposite pin, the one at the 7:00 position. Please refer to the linked photo.

For an easy way to access this power circuit to operate your fuel pump you could wire in a 7-way plug like # H20046 with butt connectors # DW05745-10 or even one with an included wiring junction box # 277-000141 to your pump. You would need to connect the two leads from the pump motor to the appropriate terminals inside the junction box using ring terminals # DW05705-1 and simply plug it in when you need it.

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Adam R

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