I'm running a pair of stebel compact Nautilus air horns on my DD F150. I just used the positive wire that attached to the original horn to power the relays for the new set.
To do what you want, I'd find a switch that has one input and two outputs. Run the horn positive to the input and run from one output back to the stock horn input and from the other output to the new relay input for the new horns. That should work.
__________________
Current vehicle list: 17 RAM 3500 4x4 Cummins Aisin 4.10, 24 Cedar Creek 40CBK
|