HornMy horn did not work when I got the car. Sometime after changing to the Momo steering wheel and its horn button with the Porsche crest, I pushed the button, probably by accident and was very surprised to hear a sound kind of like what might happen if you stepped on a cat's tail.So I've thought about buying a set of Hella horns and a new relay. The electrical circuit is probably fine, it's just that I have an old cat. In looking at the wiring diagram the hot side of the horns are black and yellow wires which go separately to the horn relay. A red wire goes to the number 4 fuse. The horn button is across ground to a white and brown wired to the horn relay. The relay is normally open. Pushing the horn button grounds the coil in the relay, closing the switch which puts 12 volts on the horns. You should see +12 volts on the wire to the horn button. A note from Bob Wonsetler ('66 912) points out that the brown ground wire from the cigarette lighter to the firewall is a necessary part of the horn circuit.
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Dave Hillman
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