Power for lift axle on trailer

I have a second electric cord set up on my trailer

 

Your going to have to do trial and error with a hot wire to see what works the axle. I am thinking that the auxillary outlet only has a few wires connected to it. I have a reefer, I have my trailer interior lights hooked up to a switch on my dash, as well as a separate switch for lights under my trailer. I have reverse light running through the auxillary cord as well. You can use a good test light to find out with one is a ground.

 

Ok, then you are almost there. You can buy the outlet, cord and a bracket to mount the outlet to the rear of your cab. Thwy make a bracket specifically for the outlet. Then run a wire from one of your switches.

 

You can put an inline fuse if you like, or run trrough one of the auxillary fuses in your fuse box.

 

It's possible your unused switches already have power to them or you can probably buy a harness to get power from another switch but they are stupid expensive for what it is.
Just grab power from wherever just make sure its fused. Hook up to your switches, find a good spot to run wire through the firewall and to the back of the truck. Just watch where you route and tie up your wire so it doesn't rub on anything.
I like to use extension cord for a job like that. Have 3 wires and a good protective layer