The wire which connects to terminal B is the one that should go up to the horn button, not to ground directly. The idea is that when you ground the B terminal the relay coil energizes, closing the contacts and energizing the horn.
Tom
'70 (July '69) Ambassador 99.8% Complete, 10% Left To Go '82 V50-III Shelby Township, Michigan
Robert Hawkes wrote:
Martin, I would like a drawing if you have time, I'd be much obliged. As a note, the relay I have is a Marelli relay. The contacts on it look like so:
|-------------------------------------| | A | | | | | | __ | | | C D | | B | | | |_Bobs Marelli Relay __________|
I have jumped A and C by soldering a short wire to each contact. B is the ground. D goes to the hot side of the Fiamm horn. The horn is grounded just by attaching the horn stalk to the frame of the bike. The hot side of the horn wires from the bike itself attache to A. (I did this set up per instructions from Sport Cycles.) Perhaps I got the contacts screwed up but I did check combinations with test leads before arriving at a set up that actually made the horns sound with the tinder box horn switch. Your assistance is appreciated. Best, Bob