Brain Fart

[Mi duckdown]

Re: Brain Fart

This where a 4 dollar test light comes in handy. The trailer does not have to on the ball to make your lights work properly.

 

[UncleWillie]

Re: Brain Fart

This where a 4 dollar test light comes in handy. The trailer does not have to on the ball to make your lights work properly.

Precisely!

With no trailer attached at all.
Turn on the Tail Lights of the Truck.
Test between the WHITE and the BROWN pins on the truck connector.
If you do not see 12+ volts. The ground is faulty.