Wiring for air dump on spread axle.

Don't believe there is a standard - just so long as you keep your diagram handy, you're all good.

 

Pretty simple, you just have to supply power to the valve, all you need is 1 wire.

 

Why do you have to run 7? You can run 1 into a 7 way

 

Why not use a 4 pin round plug? We use them all the time for trailer on board scales. Only have to run 4 wires that way.

 

Wonder if you could battery power it with one if them chunky car batteries and a remote control. That'd be cooler than cool.
Beep/pssshhhhh

 

back in the days when ABS first started coming out I had a tractor that had two 7 way plugs ins on the back of the sleeper, one for switched power to the center port on the pigtail and one for constant power to run ABS. I had a spread axle that didn't have ABS so I hooked the dump valve to the center port and ran the dump from the switch on the dash. It was a quick way to dump 700lbs off the tractor if a situation arose that called for it.

 

My dump valve is on a separate 7-pin and it's just 1 wire for the dump valve for the past 13 years. Why run seven wires, that is an extra 300 feet of wire, am I missing something.