Engine Tach issue

[britinusa]

We found an issue during our 5 day cruise down to Biscayne Bay and back over the past long weekend.

The Tachometer would indicate 0 rpm while the engine ran fine, just a change in the engine sound.

It happened many times (after about 4 hours of motoring).

I'm leaning towards it being a regulator issue.

Wrote up details on my blog. http://www.sailingeximius.com/2017/11/regulation-issues.html

Paul

[Ron Hill]

Paul : Look at the white wire from the tach to the alternator!!  That's probably your problem!

A thought

[mainesail]

We found an issue during our 5 day cruise down to Biscayne Bay and back over the past long weekend.

The Tachometer would indicate 0 rpm while the engine ran fine, just a change in the engine sound.

It happened many times (after about 4 hours of motoring).

I'm leaning towards it being a regulator issue.

Wrote up details on my blog. http://www.sailingeximius.com/2017/11/regulation-issues.html

Paul

Set your alternator regulators float and absorption voltages higher than the solar controllers absorption & float or add a switch to temporarily disconnect the PV with motor running or purposely set the PV voltage lower than the alt or punch up some DC loads....

If the combination of PV and alt that will allow, if set up incorrectly, the PV voltage to creep beyond alt reg set point. When this occurs the regulators only choice is to kill the alternator field until voltage drops back to within the regulators limiting point.. Killing the alt field shuts off the stator pulse and thus no tach.

if you can live without the tach it is really no big deal...