wats up guys im just about done wiring my train horns and compressor but in the diagram fabiansc made me it says to hook one wire from the relay to an acc or accesory wire that turns on only when the key is turned , can somebody help me out its a 2000 supercab 5.4 thanks guys

 

What do you want to know? Where you can access switched +12v?

 

yes ssir im just ntr sure wich wire to tap into

 

Well you can go to your fuse box, and tap into the radio fuse (#3 I believe) or just go behind you radio and tap into it there just make sure its the switched +12v and not permanent power.