Wiring for air dump on spread axle.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by slavcha, May 15, 2016.

  1. slavcha

    slavcha Light Load Member

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    I need to instal air dump on spread axle trailer. I'm planing on installing another 7 way connector to run wires for dump, and have some extra circuits for future projects like lift for front axle. So my question is there a standard way of wiring it or i just wire it any way as long is it works? Thanks.
     
  2. blairandgretchen

    blairandgretchen Road Train Member

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

    mslashbar Medium Load Member

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

    slavcha Light Load Member

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    Yes its all i need is 1 wire, but have to run 7 lol.
     
  5. Razorwyr

    Razorwyr Road Train Member

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

    AModelCat Road Train Member

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    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.
     
  7. Ruthless

    Ruthless Road Train Member

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    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
     
  8. gunner76

    gunner76 Medium Load Member

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    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.;)
     
  9. slavcha

    slavcha Light Load Member

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    I don't know exact wiring schematic for 7 way, but i think clearance and tail lights are on separate circuits, and combining them in to 1 will free one wire for a dump. Any thoughts on it?
     
  10. Luwi67

    Luwi67 Heavy Load Member

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    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.