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House batteries do not charge

PostPosted: Mon Dec 06, 2010 10:41 pm
by islander32
I am new to my sailboat and have an SAR serving a 100-amp alternator. I have a single starting battery and a pair of house deep cell batteries. All are wet and new. The old house batteries were shot when I got the boat (would charge from AC and not hold a charge for long).

When under power, the starting battery receives a charging current (14.3-14.7 volts), and the house batteries never receive a charge from the alternator. When I first had the boat, the house batteries received a charge, and then it became intermittent (isn't that how it goes with a boat purchase). Now the house batteries will only charge when pluged in to AC.

There is no error light; the parallel light is on; the status light nearly always indicates "Absorption Charge."

Any ideas on why the house batteries do not reach current from the alternator?

Re: House batteries do not charge

PostPosted: Wed Dec 08, 2010 6:39 pm
by Coulomb
Battery switch?

Re: House batteries do not charge

PostPosted: Thu Dec 09, 2010 7:43 pm
by islander32
I don't think it's the battery switch. House is on; engine is on; emergency cross-over (red removable key) is off. If I activate the cross-over, then the batteries receive charge, but that is not how the system should work, right? My understanding of the regulator is that is can direct the charge to the bank (house or engine) that needs the charge.

Re: House batteries do not charge

PostPosted: Wed Dec 15, 2010 12:52 pm
by Coulomb
The regulator can't deliver a charge without a connection to the battery.

The system is not wired according to our wiring diagrams, which show the alternator connected directly to the house bank without an intervening switch.

You will blow up the alternator and regulator sooner or later with the switches. See this URL: http://www.amplepower.com/apps/burnt_sw/index.html