Join Date: Apr 2012
Location: Portsmouth NH
Thanked 2 Times in 2 Posts
Rep Power: 6
Help! Weird Alternator Problem
This has been an issue since I bought the boat and three yards have expensively failed to fix it. I have a Yanmar JH series engine with a large AMP alternator regulated by a Balmar Maxcharge MC-612 reg.
At tickover and during early running all is well. The system charges and the tachometer works normally. After a while the tachometer drops to zero and charging stops. It can be recovered by dropping to low revs but as I increase the revs the tach drops off again. The obvious candidate is belt slip but there is no sign of belt damage and the alt seems to be spinning OK so I am wondering if something else could cause the same symptoms before I invest in a belt doubling kit. One mechanic pointed out that there is not much contact area on the alt so the doubling kit might be the answer.
I am not too worried about losing the charge, the solar is keeping up fine. I AM worried about losing the belt / water pump - particularly as I am heading down the NY East River in a couple of days...... Is there any way of making an alternator freewheel? Then it can just act as a tensioner until I can get this sorted.
Anyway, thanks for any input!
Graham (enroute to The Bahamas)
Graham and Janaki
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