Good morning everyone,
I need help to resolve an
electrical anomaly.
Yesterday I swapped out the
lift pump on my Onan MDKBL
generator (original
pump was leaking). Since installing the aftermarket replacement, I note the
alternator isn’t re-charging the
battery like it used to. When I run the
generator my fully charged
battery drops slowly to 12.45v and holds right there.
I measure 12.35 at the
alternator.
Historically (consistently for 5 years) my generator’s alternator charged only to 13.1v. I don’t know if this was by design, but it worked, so I didn’t change anything. Well, 4 years ago I did pay to have the alternator “serviced”, but nothing changed, and I’m not sure there was any “service” done to the alternator.
But… with the simple swap of a
lift pump my battery loses charge when the generator is running.
Thoughts?
Could it be the aftermarket lift pump (that seems identical in every way, shape, size, voltage, PSI, etc) is drawing more
power than the alternator is producing?
What else would cause the voltage to drop to 12.45 and hold there?