the 3 prong has an extra ground, a 2 will work as well.
out of the 3 wires coming into the flasher base, one is ground, one is always hot (when the key is 'on') and the 3rd goes to the switch on the handle bar.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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