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I have a 2004, 6BTA5.9-M3 with a OEM primary station at the main helm and a OEM second station analog panel on the flybridge. The second station is sending an “oil pressure” alarm while the mail station is silent. Both stations are showing 50 psi on the gauge. The second station can temporarily silenced but activates after about a minute. The mail station remains silent. How do I know which station to trust? Both gauges give the same reading. Why would the second station alarm activate? How can the problem be corrected?
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Each engine has two oil senders. One is variable and gives you the pressure reading. The alarm sender is binary (on/off). The alarm goes off when the sender circuit goes to ground. So its possible to have adequate oil pressure and still get a low pressure alarm if the alarm sender is bad or there is a path to ground somewhere else in the circuit.
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I suggest get yourself a mechanical pressure guage of about 0-100PSI and mount it on a TEE where one of the sensors /alarms is.
The mechanical guage will tell you what the pressure is and which guage is correct.
I always suggest using steel hydraulic fittings for any connections to the engine. THey are stronger and more vibration resistant than brass fittings. If you do go brass then use ONLY the FORGED brass fittings as these are more resistant to vibration than the extruded brass fittings..
I also suggest that you carefully check the electrical connections at both ends of the wiring. Any corrosion or loose/poor fittings will increase resistance which will affect the sensing. If they show ANY corrosion of the contacts then try cleaning. both sides, I have fixed many not working guages on my boat simply by cleaning , tightening and in some cases installing new terminals on the wires.
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