1) With the engine running, disconnect the yellow lead from the engine switch, and ground the lead against the engine. The oil alert lamp should flash, and the engine should stop.
2) With the engine stopped, the crankcase filled with oil, and the oil level switch leads disconnected, check continuity between the yellow and green oil level switch leads. There should be no continuity.
3) With the engine stopped, the oil drained from the crankcase, and the oil level switch leads disconnected, check continuity between the yellow and green oil level switch leads. There should be continuity.
