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ELECTRONICS

HOBBS Meter Enable Circuit

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UPDATED 2026-09-16
TYPECircuit
USE-CASEHobbs Enable
EXAMPLEHOBBS Meter Enable Circuit
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CASE ANALYSIS

Scenario

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.

Key decisions

  • 2 A fuse on the L terminal input
  • 15 V zener clamp across the meter input
  • Series resistor limits zener current

When to reuse this

Reuse for diesel generator or marine alternator hour-meter enable circuits that sense an alternator tap and require overvoltage/fuse protection.

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