Generac — Testing the Low Oil Pressure Shutdown
Testing & diagnosis · Low oil pressure switch
From a Generac service manual covering: IM100G, IM80G, NP100G, NP80G. Check it applies to your exact model before use.
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Procedure
- Start the engine and let it run at no-load with all electrical loads disconnected.
- Disconnect wire from oil pressure switch terminal and hold the wire terminal end against a clean frame ground on the engine.
- After a very short delay, the engine should shut down.
Specs & values
- Oil pressure switch contacts close below approximately 12-15 Amazon eBay FridayParts $19.30 psi
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.