CIRCUIT · HOBBS ENABLE
Hobbs Enable Circuit Diagrams
Explore HOBBS meter enable circuit diagrams showing how to wire a Hobbs hour meter so it runs only under specific conditions—like when the engine is running or a master switch is on. These examples cover common configurations used in aircraft, generators, and industrial equipment.
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ABOUT
About these examples.
Whether you're an avionics technician, a DIY builder, or an engineer maintaining machinery, these diagrams give you a clear starting point. Use the generator below to customize your own enable circuit.
HOW TO
Make one yourself.
Open the circuit diagram tool
Start with a blank canvas or a circuit template in the diagram maker.
Add the Hobbs meter and power source
Place the Hobbs meter, a power source (e.g., battery or bus), and any switches or relays.
Wire the enable signal
Connect the enable condition (oil pressure switch, master switch, or ignition) to control power to the Hobbs meter.
Label and verify
Add clear labels for each component and trace the circuit to ensure the meter only runs when intended.
Export or share
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FAQ
Frequently asked questions
What is a HOBBS meter enable circuit?
It's a wiring arrangement that supplies power to a Hobbs hour meter only when a specific condition is met, such as engine oil pressure or a master switch being on.
How do I enable a Hobbs meter with an oil pressure switch?
Wire the oil pressure switch in series with the meter's positive supply. When oil pressure closes the switch, the meter receives power and starts counting.
Can I use a relay for the Hobbs enable circuit?
Yes, a relay is often used to control higher current or to isolate the enable signal from the meter. The relay coil is driven by the enable condition, and its contacts switch power to the Hobbs meter.
What voltage does a Hobbs meter typically use?
Most Hobbs meters operate on 12V or 24V DC, but always check the specific model's datasheet for the correct voltage and current requirements.
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