How To Test Trailer Lights With A Battery Charger. They dont then I will take the drums off and do further evaluation. I have a few trailers now and keeping after their lighting is getting to be a pain.
The most common gauge trailer light wire for 4-way or 5-way trailer connector is 14-16. Wire the vehicle side wiring harness to a standalone battery. The lights finally went out when the battery ran down.
The lights finally went out when the battery ran down.
My whole objective is to purchase all the parts in one shot so I am. With two wires extending from trailer lights the wires are ready for connection to a power source. You dont even need the vehicle part of the harness. Twist the dial until the pointer enters the DC range stopping on the next-highest setting to the voltage of the charger youll be measuring.
