상황
Enables a HOBBS hour meter only when the Cummins Onan diesel generator is running, using the alternator L terminal as a speed signal. The 15 V zener clamps voltage spikes and the 2 A fuse protects the circuit.
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01
2 A fuse on the L terminal input
02
15 V zener clamp across the meter input
03
Series resistor limits zener current
Reuse for diesel generator or marine alternator hour-meter enable circuits that sense an alternator tap and require overvoltage/fuse protection.