Originally Posted by pisail
I have a Yanmar 3jh4e witha a Balmar alternator that reads zero when idleing but come back up when running. Belt is tight and connections seem good. Any ideas?
If you have a programmable alternator regulator you may be able to change the programming to activate your alternator driven tach at lower RPMs/alternator output.
As an example, we have a similar condition with our tachs (two tachs driven off the same alternator...)
e.g., We programmed our Balmar regulator to delay 45 seconds after engine
start before initiating a slow [60 second] ramp-up of alternator output. During the 45 second delay period, the tachs read zero, but the trade-off is worth it to us. [i.e., We don't want a 120amp alternator to start putting out maximum current
to a depleted battery
bank immediately upon engine start...]
The tachs always provide readouts once the start-up delay period is over no matter how small the output is from the alternator.
Good luck working this out.