Low Voltage on 7-Way of 2017 Ford F-250 Super Duty

Updated 08/17/2020 | Published 08/13/2020

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

(735)

$36.94

Dielectric Grease for Electrical Connectors, 2 oz.

(1491)

$11.16

Question:

Testing a 7 pin plug on the truck I get good power out of the the turn signal lugs and brake but barely any power out of the trailer lights lug. Do you know what would cause that.

asked by: Dan I

Expert Reply:

There are a couple things that may be causing the low voltage you are seeing on the 7-way of your 2017 Ford F-250 Super Duty. The first is a poor ground, so check to ensure the ground is good as this can cause the issue you are having.

The other likely problem is corrosion on the pins of the 7-way so you will want to check to see if the pins have corrosion and either clean them or replace the 7-way with the Curt T-Connector Vehicle Wiring Harness # C55774 or 7- and 4-Pole Trailer Connector Socket # HM40975.

Also, to ensure corrosion does not occur in the future, it is highly recommended that you always use Dielectric Grease for Electrical Connectors # 11755.

expert reply by: Kyle S