Oil Pressure Warning Lamp/Indicator: Description and Operation

CIRCUIT OPERATION
The low oil pressure lamp is used to indicate to the operator that the engine oil pressure has dropped below a predetermined pressure. Power for the lamp is provided on the G5 circuit which also powers the other warning lamps.

When the oil pressure is low the normally OPEN oil pressure switch CLOSES completing a path to ground. The oil pressure switch is case grounded to the engine block.