COMPU-FIRE® Instructions

Charging System Troubleshooting

COMPU-FIRE® Selectable Electronic Advance Big Twin®, Sportster® and Buell® Ignition Modules for Nose Cone Applications - This instruction covers the following:

• 20600 1970-1999 Big Twin, Electric Start, exc. Twin Cam
• 20835 1980-1999 Electric Start, Race, exc. Twin Cam
• 21835 High Compression Street Big Twins 80-113 ci Electric Start
• 21835KS High Compression Street Big Twins 80-113 ci Kick Start
• 21850 1971 & up Supersport Street Sportster & Buell exc. 1200S.
• 21860 Supersport Race Sportster & Buell exc. 1200S

COMPU-FIRE® Plug n Performance Ignition Module - These instructions cover the following:

• 25000 Plug in Module 1991 - 1993 Big Twins® with 7 pin "d" conn.
• 25010 Plug in Module 1994 - Present Big Twins® with "deutsch" conn. (Except F.I. & Twin cam)
• 25020 plug in Module 1991 - 1993 Sportsters® with 7 pin "d" conn.
• 25030 Plug in Module 1994 - Present Sportsters® with "deutsch" conn. (Except with O.E. Single fire)

COMPU-FIRE® High Performance Voltage Regulators - This instruction covers the following:

• 55120/55130 1989 - 1999 Big Twin w/ 32 amp charging sys. & earlier Big Twins w/ 32 amp sys.
• 55121/55131 1981 - 1988 Big Twin w/ 22 amp charging sys.
• 55122/55132 1976 - 1980 Big Twin w/ 17.8 amp charging sys.
• 55123/55133 1970 - 1975 Big Twin w/ 15 amp charging sys.
• 55124/55134 1984 - 1990 Sportster w/ 19 amp charging sys.
• 55125/55135 1991 - 1999 Sportster w/ 22 amp charging sys.

COMPU-FIRE® Harley-Davidson@ Ignition Module Kits - This instruction sheet covers the following part numbers:

• 20100 HD-1M DUAL FIRE SINGLE PLUG BLUE ROTOR
• 20200 HD-2M SINGLE FIRE SINGLE PLUG RED ROTOR
• 20300 HD-3M DUAL FIRE DUAL PLUG BLUE ROTOR
• 20400 HD-4M SINGLE FIRE DUAL PLUG RED ROTOR