I recently purchased a book "How-To: Advanced Custom Motorcycle Wiring" Custom Builder Series.
On page 61 it shows the difference in the single and dual fire coil wiring.
The single fire coils has three terminals: The far left has a GREEN wire from the trigger plate, the middle terminal has a PURPLE/VIOLET wire, again from the trigger plate, and the far right terminal has a YELLOW wire going to the ignition switch(possible a 12 volts switched source).
The dual fire ignition coil has two teminals: the far left has a PURPLE/VIOLET wire from the trigger plate and the far right terminal has a YELLOW wire from the ignition switch.
I suppose if the HD coil is compatable in OHMS, it would work in your situation. Have your looked at Dyna,Accel,MSD, or Mallory for coils?
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