Engine Alarm 1986 evinrude

[Patrick Campbell]

Looking for help, I have a 1986 evinrude 150 thats been giving me an engine alarm but i can't seem to find anything wrong. Does anyone know how to test the sending units on this engine to see if i have a bad sending unit? alarm comes and goes it will stay on for a minute or two then shutoff again. It has done this at all rpms and hot and cold engine condtions?

[clanton]

Are you still running VRO pump, and how many wires in harness to pump? Is horn steady or what?

[Patrick Campbell]

Still running VRO pump, Horn is steady when it is on. Haven't checked the wiring harness yet. Will check that today.

[clanton]

A steady signal would indicate overheat, fuel restriction, or bad horn. 5 sensors 1 at oiltank, 1 at oilpump, 2 on heads for overheat, and 1 for fuel restriction. Unplug sensors one at a time and run engine.

[Patrick Campbell]

Thanks, I'll give that a try.

[Paddling]

Hi Cyclops30, I have the same engine. On mine, the sending unit in the oil tank went bad last spring. Normally it sounds for 1/2 second on every 20 seconds when oil is low. Mine shorted and sounds continuous. I disconnected the sending unit since I can see my tank level. My sources say the sending unit only comes with a new tank, expensive fix when the tank don't leak.