Thread: Testing overheat alarm circuit

Huntersdad, what's serial# of motor, is it a. Ficht motor? When you turn key on , do you get 1/2 beep
Then LED lights in gauge, all come on then go off?

1/2 second beep.

If not a ficht motor there are , 2 temp. sensors 1 with w/b wire and brown/yellow on port side. Starboard side has brown/yellow, disconnect both brown/ yellow wires.

Model is 115PLSIG it is a 60 degree Looper from what I understand about the motor. I have noticed for some reason that putting that model number in on any parts websites it doesn't give me any results unless I change the G to another character so I'm not sure if that is a misprint on the tag or what. I had the 4-wire vro plug disconnected as well as the oil tank sensor and plugged the oil line. When I turn on the key to the on position I get the short beep then one by one lights go out and then come back on. Those lights are low oil, no oil, and temp. The only light that goes out is the check engine. When I start the motor I immediately get a steady tone for around 30 seconds and then the horn turns off but those lights remain on. I have also tried disconnecting both temperature sensors prior to starting and the horn immediately goes off as soon as the engine starts to run. All wires look good from what I can tell my only other thought is that possibly the tach has gone bad but I personally do not know how I can test it.

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If tach. Is shorted to ground , try disconnecting gray wire at back of tach. gauge.
Does tach. work when you start motor?

It was working..how well I'm not sure.. I don't know if it's accurate because so far I've only run the engine on muffs so I have not had it above an idle. According to the tack it was just over a thousand RPM when it was running. Just trying to get all the bugs worked out before I actually put it in the water. I will disconnect the gray wire and report back

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The only gray wire I saw was part of the wire harness that went to the tach and I'm not sure how to remove that without cutting it. One thing that I did notice however was when I disconnected the wire harness from the tach and put the positive probe in the motor side temperature sensor wire. And negative to the block I did not get continuity but with the Harness connected I do. So if I understand this correctly my grounding issue has to be somewhere from the tach harness to the tach itself. Please advise on moving forward

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No need to disconnect gray wire from tach. If it's reading 1000 . it's working.
Did you remove oil tank , oil supply line and capped off barb, where oil hook to , and zip tie, cap. Cap is on a yellow plastic horse shoe holder that's clipped on oil line on port side of motor, if that's not there. Cap the oil line with a bolt or something ,u don't want trash sucked in pump. Remove oil tank ,oil line and wires going to motor. Disconnect oil pump 4 pin amphenol connector at vro pump. Take some rtf silicone and fill that connector to seal those four pins.