Okay, it is not spliced into a line, you guys are once again correct, it is a seperate line running inside the loom. The third wire goes to the horn! and to my surprise actually works. The horn is mounted on the firewall above the starter. I am not getting any power to the coil using a tester it appears, even with the switch on. I am thinking of running a new line from the coil to the ignition. Is the 14 gauge wire okay? Is this a good idea?