ABS cord

maybe a extra cord and plug for a lift gate trl.

 

The yellow cord is a 7 way ISO, on our trucks they power the dump valves for the axles, lift axles and for extra lighting on trailers

 

This here?



We need it because we have so many trailer axles. I think there's another way to run multi-axle trailers without using it (but don't hold me to that), 99% of our fleet is setup using it.

 

Depends. If you have an older trailer without PLC(Power line carrier) enabled ABS, then it cannot communicate with the truck's ABS system that is expecting it. PLC is just the fancy term used for how the trailer communicates it's ABS status with the truck to turn on or off that light. I think around 2001 was when it was mandated. If your trailer is newer than that, then it is basically an ABS fault light which fails a safety inspection. If the light never comes, that is a fail. If the light comes on and stays on, that is also a fail.

 

I'm not that smart on wiring setups but all our trailers are wired with the center ABS pin on the green cord always hot (with key on)
The yellow cord uses the pin in the 1'clock position for switched power for lift and dump axles, 12'oclock is ground.

 

I think I've seen a couple trailers with lift axles that have the control mounted on the trailer itself.

 

If nothing else and the trailer has the extra outlet up front I'd trace the wires back from the outlet to see what they go to