Oil sending unit reads 250 ohms which is matched to the oil gauge. While having the mechanical gauge hooked up I left the wire on the sending unit which had no pressure and the gauge still read 80 which is the max on the gauge. Somehow when the ignition is on it’s making the gauge read 80...
I should also note the oil pressure is in the gauge cluster consisting of water, oil, fuel, and voltage. So all the other gauges worked fine meaning that it probably is not a voltage issue leading to the gauges since all the other gauges read as normal and function properly.
It is strange because when I disconnect the wire from the sending unit, the gauge will still read 80 psi. But when I leave the sending unit hooked up and I turn the ignition off the pressure reading goes down to about 30 to 40 psi.
When we bought it, it had the original gauge and the original sending unit. I would assume both these worked fine from the factory. We got the boat last year in the cage has been replaced and I have tried another sending unit with the same results.
The gauge was indeed replaced as it’s a different cluster of gauges than when we got the boat. I would have to check the voltage when running. Should I check voltage at the gauge? The old gauge read the same 80psi hence why we brought the boat in for repair.
I have a 2005 four winns with a 5.0 GL VOLVO. The boat is new to us. The oil pressure reads 80 psi when ignition is on but not started. ( drops to about 30-40 when off) It also reads 80 psi when started. A boat mechanic replaced the gauge but still reads 80. I checked the ohms at the...
