Help with wiring on a trailer

Chainsaw13 · 01-11-2015, 06:38 PM

Helped my friend try to fix one of the brake lights on his snowmobile trailer. Right side works fine, has both running lights and brake/turn signal. Left side, only running lights work. Thinking it might be the bulb, we swapped fixtures. Same result, no brake on left side, only running lights. Remove the light fixture and measure the voltage levels at the connector. The one plug for the running lights had proper voltage when those lights are turned on. The other plug for stop has a constant voltage when brake pedal applied, and a on/off voltage when turn signals on.

We did some resistance testing too and found the ground on the left side wasn't good. There but a higher resistance, so we spliced in a new line and grounded it better. That only gives us a better resistance reading.

Anyone have any ideas? Not like it's rocket science, just DC wiring.

01-11-2015, 06:38 PM	#1
Chainsaw13 Møøse bites can be nasty Join Date: Jan 2010 First Name: Bob Location: The Enchanted Mitten Posts: 7,198 Trading: (96)	Help with wiring on a trailer Helped my friend try to fix one of the brake lights on his snowmobile trailer. Right side works fine, has both running lights and brake/turn signal. Left side, only running lights work. Thinking it might be the bulb, we swapped fixtures. Same result, no brake on left side, only running lights. Remove the light fixture and measure the voltage levels at the connector. The one plug for the running lights had proper voltage when those lights are turned on. The other plug for stop has a constant voltage when brake pedal applied, and a on/off voltage when turn signals on. We did some resistance testing too and found the ground on the left side wasn't good. There but a higher resistance, so we spliced in a new line and grounded it better. That only gives us a better resistance reading. Anyone have any ideas? Not like it's rocket science, just DC wiring. __________________ My neighbor came by my house this morning at 2AM, pounding on the door. Good thing I was still up playing the drums.