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Dan,
I had a similar problem with my 100 Amp Balmar Alternator. The tachometer
would always operate normally with an alternator load. The alternator
provides the signal for the tachometer. If the DC out put is very low the
signal strength is low which makes the tachometer erratic or doesn't
operate. If I started my genset, the AC output would start the Heart
invert/charger and that would shut the alternator off-- and I would lose the
tachometer completely.
Balmer's fix was to install a 25 ohm, 25 watt resistor between the Blue and
Brown wires going to the regulator. This created a small continuous load for
the alternator and a stable output for the tachometer -- problem fixed.
I don't know if this is your problem, but if your tachometer signal comes
from your alternator -- you should check with the manufacturer of your
alternator for a fix.
Hope this helps.
Al Miller
M/V 37' Pacific Trawler "Pleasant Moment"
E-Mail: >
Subject: TWL: The Disappearing Tachometer
....The tachometer for the main engine seems to function just fine - *until*
I fire
up the generator. With both the main and the generator running at the same
time, the tachometer for the main goes haywire and eventually settles at
zero
RPMs, even though the main engine continues to chug along quite...
