Ignition Coil 31743-01 4-Pin Single-Fire for Harley Twin Cam

Replaces 210538, 32-0812, 0.5 ohm, 4-pin, single-fire, Delphi EFI, Softail Dyna Touring, black molded, not carbureted

FITMENT - For select Harley-Davidson Twin Cam models with Delphi fuel injection: Softail, Dyna and Touring built with the 4-pin single-fire coil, plus Softail Slim FLS and FLSS. One coil per engine. Match model code, fuel system and old coil stamp.

REPLACES - Replaces Harley-Davidson 31743-01. Later generations use 31696-07A, a separate number. Crosses Twin Power 210538, V-Twin 32-0812, Daytona Twin Tec 2009, Accel 140410, S&S 55-1576, Doss 10-2003. Not genuine Harley-Davidson.

BUILD - 12V DC, 0.5 ohm primary resistance, single-fire with two high-tension towers, 4-pin connector, black molded epoxy case with bobbin-type windings. One coil per pack. Mounting bolts, spark plug wires and the heat shield are not included.

FUNCTION - Steps up battery voltage to fire each plug on its own compression stroke, triggered by the Delphi ECM through the 4-pin connector. Resolves misfire, rough idle, high-speed cutout, hard starting and weak spark from a failed primary winding.

BEFORE ORDERING - Delphi EFI Twin Cam only, 4-pin connector. Not for carbureted Twin Cam, which use the 3-pin 31655-99 coil, not for Magneti-Marelli EFI, not for Sportster, V-Rod or Evolution. Match fuel system, plug and stamp. Disconnect the battery.