Harley-Davidson Wiring Diagram for
Dual Fire, 1 Plug / Cylinder using
Electronic Ignitions using 3 Ohm Coils

Do Not wire using points or ignition systems without saturation or dwell control.
Over heating and Damage to Coil and/or Ignition will occur!!!

Important Note: Use only Carbon Core resistor Spark Plug wire!!
Solid or Spiral wound wires will damage the ignition module or coil.

Initial settings for spark plug gaps are:
Stock Plug 0.028-0.032"

Harley-Davidson Wiring Diagram for
Dual Fire, 1 Plug / Cylinder using
Electronic Ignitions using 3 Ohm Coils

Do Not wire using points or ignition systems without saturation or dwell control.
Over heating and Damage to Coil and/or Ignition will occur!!!

Important Note: Use only Carbon Core resistor Spark Plug wire!!
Solid or Spiral wound wires will damage the ignition module or coil.

Initial settings for spark plug gaps are:
Stock Plug 0.028-0.032"

Harley-Davidson Wiring Diagram for
Single Fire, 2 Plugs / Cylinder, DF Coils
using Electronic Ignitions using
3 Ohm Coils

Power Arc Ignitions, Inc. does not recommend Dual (2 Plugs/Cylinder)
plugging your engine but if you feel that it is appropriate, this is the way to wire the coils.  Do Not wire using points or ignition systems without saturation or dwell control.
Over heating and Damage to Coil and/or Ignition will occur!!!

Important Note: DF coils can not be wired for 2 plug per cylinder Dual Fire.
Use only Carbon Core resistor Spark Plug wire!!
Solid or Spiral wound wires will damage the ignition module or coil.


Initial settings for spark plug gaps are:
Stock Plug 0.025-0.030"
Added Plug 0.015-0.020"
You are jumping double the gap under compress when dual plugging an engine.
If gapped at Stock side 0.040" and added side 0.040" your jumping 0.080" under pressure.
Would you gap a single plug system at 0.080 under raised compression?