Activating 12 Volt Accessory Circuit of 7-Way on 2017 Chevy Silverado

Updated 08/25/2026 | Published 03/11/2019

Products Featured in This Question

Hook Probe Circuit Tester

(70)

$12.41

10 Gauge Wire - Blue Primary - Per Foot

(109)

$1.90

40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket

(101)

$9.98

Question:

The 12v constant is not hot on my 7pin trailer. I tested it with a multimeter. The trailer seems to be in good working orderI hooked it up to a buddies truck. I have no 30a fuse in the #2 spot marked Trailer lights of my underhood fuse box. Which is strange because my 12v constant has worked before. I went and bought a fuse but there are no male terminal ends in the #2spot, the fuse has a female connection. Should I be looking for a male connection 30a fuse? Is there a way to add male terminal ends to fuse spot #2? Am I way off track and should be looking for a different fix?

asked by: Kevin M

Expert Reply:

To activate your 12 volt circuit on your 7-way the easy way you'd just need a 10 gauge wire like part # 10-1-1 ran through a circuit breaker like part # 9510 from the positive terminal of the battery to the 1:00 pin of the 7-way and the circuit would be active and ready to go.

Otherwise you'd have to try and track down where the factory wiring went wrong which can be tedious.

expert reply by: Jameson C