the pointy end is the bow
Join Date: Aug 2006
Location: La Conner, Washington
Thanked 27 Times in 26 Posts
Rep Power: 12
Re: I need help Oil Pressure sender?
The sender unit should have variable resistance to ground depending on the oil pressure. In the case of a buzzer, it should have low resistance when there is no/low oil pressure (which allows a path to ground, closed switch) and the sender should open the switch to ground when there is oil pressure. This is a generalization. Resistance is measured with an ohm meter. Put one lead of the ohm meter on the electric contact on the sender and the other lead on the engine block. The reading should be a closed switch, or very low ohms. Now have someone start the engine and see if the ohm reading goes higher. An alternative is to screw out the sender unit, put your finger over the hold and have someone start your engine momentarily and see if oil squirts out.
I don't understand the toggle switch test on the instrument panel. On my boat, when I turn the key to the run position, it energizes all the gauges and the low oil pressure buzzer sounds.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.