QuoteThe mechanic replaced the buzzer and the oil pressure switch on the engine but the problem persists.WOW. Didn't solve the problem, huh? Imagine that, Whack-a-Mole, willy-nilly, replacing parts instead of the mechanic troubleshooting the cause did nothing to resolve it.
Quotethe single wire from the oil sensor switch back to the panel would solve the problem or whether the whole harness needs to be removed and rebuilt.B engines have no "single wire" from the oil pressure switch that drives the alarmm unless the wiring is NOT Westerbeke OEM. The Wb scheme is a multi-conductor mess -- the alarm is always hot and shuts down when a "back voltage" is applied to the ground side of the alarm, driven by the fuel pump circuit.