A 64.5 is different than the horn wiring previously described. First off, there is a horn relay mounted under the voltage regulator. When the horn ring is depressed, it completes the relay operating coil circuit to ground, causing the relay to acutate and send power from the battery terminal of the voltage regulator to the 2 black wires coming out of the horn relay to the two horns, located and grounded on the frame.
Good Luck, Jim Finley
Good Luck, Jim Finley