2004 Poalaris MSX110, MSX150 PWC Original Service Manual, Page 222Get this manual
ELECTRICAL SYSTEMS System Interface Box (SIFB)
The primary function of the SIFB is to powerdown the ignition system in the event that the lanyard is left inserted in the stop switch for more than two minutesWithout the SIFB, the ignition system would remain poweredup by the battery, and the battery would completely dischargeA secondary function of the SIFB is to convert the reverse switch signal so the ECU can interpret the signal when the reverse switch is closed, thereby limiting engine RPM
How It works