Ignition switch controlled power source

[WHardy]

Just Installed Hadley Bulley Air Horns. Does anyone know of an easy place to tie into a circuit to power the compressor that is only hot when the ignition is on?? It seems that a fairly hefty source would be necessary based on having to drive the compressor. Is there a better way do this??? Going thru a relay etc. Reviewed existing posts, no luck with desired info. Posted here vs assessories believing I would get pertinent results.

 

[Evan A. Beck]

Splice onto the dark blue wire in the steering column. Be sure to use a fuse too. This will be an ignition-on circuit.

 

[gitchesum]

I woud definately use a relay. I used a 30 amp relay for my fog lights, as well as a constant power source through a toggle switch. That way I could turn them on with the toggle switch when I wanted to.

Use the ingition on power to power the relay.