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

Updated 06/05/2018 | Published 06/01/2018

Products Featured in This Question

7-Way Molded Trailer Wire Connector, 6' Long

(395)

$40.96

Ring Terminal - 12-10 Gauge Wire - 3/8" Ring ID

(72)

$1.91

Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 10

(1125)

$13.21

Question:

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

asked by: Jeff H

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 # e99011 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.

expert reply by: Adam R