Zhfahua Ignition Coil 31655-99 0.5 Ohm Single-Fire 3-Pin for Harley

Zhfahua Ignition Coil 31655-99 0.5 Ohm Single-Fire 3-Pin for Harley

• 12V External Ignition Coil, Single-Fire, 0.5Ω primary (test range 0.5-0.7Ω), 3-pin connector (Pin A=Rear trigger, B=V+ common, C=Front trigger), two output towers, carbureted-only, black epoxy-molded, OEM-style bolt-on. Replaces Harley 31655-99; cross 31704-99​ (Screamin' Eagle kit coil, same 0.5Ω 3-pin form), Drag Specialties 10-2001, Doss 10-2001, ACCEL 140409, Daytona Twin Tec 672494​ (40kV), Custom Chrome 16074. Main number 31655-99
• For carbureted​ Harley models: Twin Cam 1999-2006​ — Dyna FXD/FXDX/FXDXT/FXDWG/FXDL (non-EFI, no "I" suffix), Softail FLSTF/FLSTC/FLST (2000-2006, non-EFI), Touring FLHT/FLHR/FLTR carbureted (1999-2006, excludes 1999-2001 FLHT); Sportster XL883/XL1200 2004-2006 carbureted only​ (excludes 2007-2018 XL EFI which need 31656-07, and 1998-2003 XL1200S dual-plug which need 31646-99)
• Fixes misfire, rough idle, high-speed cutout, hard start, poor fuel economy. Test: primary resistance Pin B→A and B→C = 0.5-0.7Ω; secondary Pin B→output tower = 5,500-7,500Ω. If readings drift, replace the coil. ⚠️ 3-PIN CARBURETED ONLY — EFI models (any "I" suffix: FXDI, FLSTFI, FLSTFSE, FLSTCI, FXDLI, FXDXI, FXDWGI) MUST use 31743-01 (4-pin 0.5Ω). Installing this 3-pin coil on EFI will cause no-spark or fry the module
• Fixes misfire, rough idle, high-speed cutout, hard start, poor fuel economy. Test: primary resistance Pin B→A and B→C = 0.5-0.7Ω; secondary Pin B→output tower = 5,500-7,500Ω. If readings drift, replace the coil. ⚠️ 3-PIN CARBURETED ONLY — EFI models (any "I" suffix: FXDI, FLSTFI, FLSTFSE, FLSTCI, FXDLI, FXDXI, FXDWGI) MUST use 31743-01 (4-pin 0.5Ω). Installing this 3-pin coil on EFI will cause no-spark or fry the module
• Before ordering, confirm: (1) part stamp 31655-99 (main) or 31704-99, (2) your bike is CARBURETED (has a carb, NOT EFI) — no "I" suffix, (3) 0.5Ω single-fire 3-pin black coil, 12V, (4) matches Drag 10-2001 / ACCEL 140409 form factor. Will NOT fit EFI models (use 31743-01 4-pin), 1999-2001 FLHT carb, 2007-2018 XL EFI (31656-07), 1998-2003 XL1200S dual-plug (31646-99), or V-Rod/Evolution. Photo old coil label + connector to verify