Yanmar tach sensor wiring question

A

azambella

.
Sep 27, 2008
117
Hunter 33 salem
Is there polarity to the tach sensor connections ?

It is supposed to be AC volts but I see different color wires so maybe it matters ?

Any help is greatly appreciated...

Thanks
 
D

dlochner

.
Jan 11, 2014
12,531
Sabre 362 113 Fair Haven, NY
Is this the Yanmar with the sensor counting teeth on the ring gear? If so, I don' think there is a polarity issue.

Are you asking because the tach isn't working?
 
A

azambella

.
Sep 27, 2008
117
Hunter 33 salem
Yes, Tach not working.

Too winter up here now to do anything about it but, come spring, I want to have all the details in place to get it done.

so,
Measure AC volts from sensor.
Check wire crimp connections on sensor and replace if needed.

If above is OK, must be tach it's self...

Sound about rite
 
Davidasailor26

Davidasailor26

.
May 17, 2004
5,502
Beneteau Oceanis 37 Havre de Grace
What Yanmar engine is it? Some of them have tachs driven by the flywheel, some are driven by the alternator. The troubleshooting procedures will be different depending on that.
 
D

dlochner

.
Jan 11, 2014
12,531
Sabre 362 113 Fair Haven, NY
On our fly wheel driven tach the sensor failed. The sensor should have 1.6 +/- 0.1 Kilo ohms resistance and the output should be 1 vac or higher. The other issue is poor connections.

The service manual for you engine should have instructions on testing the sensor.
 
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