Port battery


F

formulatr

Member
Ok. Boats out of the water, with charger off, batteries die within two to three days, charging relay to windlass starts clicking due to low voltage...the only items direct to battery are high water and bilge pump, neither on, so is it the mercathode draining, and possible cause. Any comments ?
have boat 10 years never really hooked up shore power on regular basis, until this issue
 
Do you have a dedicated windlass battery ? On my boat the windlass battery is up in the bow and is wired in series to the port batteries. There is a "smart relay" that is supposed to control whether the windlass battery gets charged or not. If the windlass battery is bad and under a certain voltage, the relay will NOT let it pull voltage from the main batteries. This is designed to keep the windlass battery from draining your main batteries and leave you stranded. You may have a bad windlass battery....AND a bad smart relay....allowing the windlass battery to drain your main batteries There were issues for a few years with the relays formula used in the mid 2000's. They were "Paneltronics" brand. They replaced them with "Blue Sea" brand.
 
Thanks. No dedicated battery up forward, two batteries on port bank, grouped..TAG says only things drawing after battery switch is off are bilge pump, high water alarm, windlass ..which all operate on demand ,and mercathode..replaced charging relay under bunk...
 
Formulatr,
I am confused. If you have a charging relay up front, you must have a battery. Did you lift the mattress and remove the screws on the cover over the battery?
 
Ok. Quick question. On my 26 pc I always turned windlass circuit breaker off, haven’t done so on 31...read recently on Lewmar windlass that breaker should be turned off until used
comments?
 
Not sure if this applies or not. We have a constant power circuit breaker that I shut off out of the water. It’s a constant power relay that would run the batteries dead in a couple days. To check for a draw disconnect the battery cables and put a 12 volt incandescent light between the loose cable and battery terminal. If the light is on you have a draw. Turn off circuits until the light goes out. Best to disconnect all negative terminals and just use one negative to test.
 
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