Generac — Test 5 - Test Oil Pressure Switch
Testing & diagnosis · Oil pressure switch (Wire 86 circuit)
From a Generac service manual — check it applies to your exact model before use.
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Procedure
- Set a VOM to read DC voltage and to a scale greater than 12 volts DC.
- Connect positive VOM lead to Terminal 86 of terminal board TB1 and common lead to terminal 0 (ground).
- With the engine shut down, voltage reading should be zero.
Tools required
- VOM Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- VOM reads about 11 volts if switch contacts or Wire 86 circuit is open
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.