The horn wire will probably be black. Putting a test light to it won't tell you if it's hot, since it only completes the coil side of the relay circuit to ground. You have a hot on one side of the the coil, the ground for the circuit is completed when you press the horn button. It is grounded to the steering shaft or column. Once the coil circuit is energized, it will close the switch side of the relay.In most cases, there is only one connector on the horn itself.The horn is actually part of the ground circuit on the switch side of the relay.The hot will come from the fuse block. If you take your DMM, set it for continuity, probe the hole where your horn contact goes in. you can see the rotory contact on the canceling cam through this hole ( about 1/4" dia. ). Then, probe the wires at the base of the column, until, you find the wire with continuity. This is the wire that goes to the "coil" side of the relay. The rest is a basic relay circuit. Hope this helps.
Jim Sgrig "Piewagn"
