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AuthorMessage
Fermain
Fermain

Posted: Tue Jul 30, 2013 9:35pm

Post Subject: Batteries

Hi, My boat originally had one 110ah starter battery and three 110ah leisure batteries. I have now changed this to a 120ah starter and four 110ah leisure ones. Since doing this when changing gear from reverse to forward I get a brief warning sound from a buzzer, which i think is for the leisure side. The alternators which are showing charging are 50amps starter and 70amp leisure, any thoughts

Tony-B
Tony-B

Posted: Wed Jul 31, 2013 8:26am

Post Subject: Batteries

It sounds to me as if the revs may be dropping far too low. Possibly related to a higher alternator load, especially if it only does it for an hour or so after the first start of the day. Much depends upon the engine make and model. This is more likely on a traditional engine with a very low idle speed. The cure in this case would be to fit a larger engine pulley or a smaller alternator pulley. But first make sure the belts are at the correct tension and not worn. The buzzer is probably also monitoring oil pressure and possibly engine temperature so you need to be sure that something has not happened to the oil to make it too thin (usually a fuel leak into the sump)and that there is nothing else wrong like an oil pressure relief valve jammed open. It may also be a faulty oil pressure sender unit. There is a slight chance that you might have a short circuit on a wire that only occurs as the engine moves about on its mounts under the prop thrust. Tony Brooks

Tony-B
Tony-B

Posted: Wed Jul 31, 2013 3:09pm

Post Subject: Batteries

I have been giving this more thought. You do not say why you changed the batteries so I wonder if there is something wrong with the alternator. An alternator is actually 3 generators in a single case and if one of these fails the batteries may still receive a charge but at a reduced current and voltage. At various times during the day cup your hands around the charge lights and look for any signs of the bulb glowing. If you find it is then the alternator needs removing and testing at at photoelectrical specialist. Most large towns have at least one. Ask for a lead at your local garage. Tony Brooks

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