I'm in need for help to resolve an issue with my alternator
Here is what I have:
is a 1999 Yanmar
4JH2E whitch came originally with an 80 Amp (Hitachi) alternator
. I have a 120 amp 12V starer battery
(new in November 2013) and a new house battery
bank consisting of 2 x 2 6V Duracell ECG2. The battery charger
is a new Sterling Pro Charge 60Amp unit.
Here is the problem:
The built in alternator did not charge anything anymore. I had it bank tested and it is shot. So I bought a 50amp alternator (from Spydermarine), and installed it. Surprisingly, the new alterator is not charging
What did I try alredy?
- I measured the voltage at the alternator while the engine
and the battery charger
was off. The voltage is between 12.6 and 12.8 volts, the same voltage as when measuring at the starter battery directly.
- I rang through the cables
from the negative shunt to the ground at the engine and there is connectivity (why else would I have volts on the alternator..).
- I did clean all the cable connectors with a wire brush to remove corrosion
- When switching the battery charger on, the voltage on the battery increases to 13.8 volts.
- I removed the new alternator and had it bench tested. It is charging
on the bench.
- I increased the rpm
on the engine from 700 to1000, 1500, 2000 and 3000 rpm
. Nothing changed. Not charging.
- I turned the refrigerator
, the lights etc. on to have some load on the battery (7amps were drawn) and ran the engine at the different rpm's again. Not charging.
So I called a marine
electrician from the yard to help me out. We whent trough the whole procedure again - with no success.
I'm looking for a hint, something I'm overlooking or I could test to find the reason why the alternator is not charging. Any help is appreciated!