Can I tap into trailer 7-pin 12v power?

xcntrk wrote:

wcjeep wrote:
Wouldn't it be faster to run home run wire from the battery to compressor location than messing with 7 pin factory wiring.

The compressor kit requires switched ignition power, otherwise it will constantly consume power when the rig is off keeping the bags at pressure. So no, a direct line to the batt won't do any good here. Also this kit has a wireless controller so the pump & manifold are installed on the exterior (either engine bay or under the rig) and no wiring or controls penetrate the interior cabin.

hammer21661 wrote:
Run a wire from the battery to a solenoid then hook the solenoid to a switched circuit. Always remember to fuse it. I don't know but the vehicle could have provisions for something like that.

This is how I would normally do it in using a relay with constant power source and trigger off switched ignition source. However the kit comes will all that as part of the harness and all you do is wire up a single supply to 15-amp switched source. I've dug through my engine bay fuse box looking for a switched power source and nearly every circuit is constant power. The only switched circuits are all power control modules for the engine which I'd prefer to stay away from.

I think I'll use the 30amp trailer switched power and throw an extra fuse in the glovebox. If I ever encounter a problem where the trailer draw and air-bag compressor draw over-subscribe this circuit at least I'll have an extra fuse to restore power if necessary.