I wired them according to the instructions (i think!). Power feed with an inline 20amp fuse from the pos. terminal from the battery to the relay that came with the horns. Relay to the compresser, relay to ground, compresser to ground. And the power from the stock horn to the relay switch. I'm thinking maybe it's really sensitive and I'll run the ground directly back to the negative terminal on the battery instead of the chassis, but I'll bypass the terminal to make sure the horns are good also.
