I've got a 41B that I was warming up the other day and the oil check alarm started up. Not full blast, sort of a half volume. I checked pressure with a manual gauge, its good. I checked the switch with a voltmeter, its good. I' getting 3-4 volts between the bl/w wire and ground when running. The oil press sending unit shows 8volts between the lb wire and ground when running, and its working.. I'm thinking theres a short somewhere in the circuit....any ideas out there?