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Old 09-12-2019, 05:17 PM   #1
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12 Volt power leak/flood!

Just got back from a long road trip and put my 1998 Discovery back in storage for a much deserved rest. It set for a couple of days and i remembered that i had forgot to shut off my main and aux battery switches, i went back out and the batteries were low but i was able to start the engine and had it running for 45 minutes to charge up. I shut down the switches and felt that all was good. The next day i went back out and the batteries were not low they were completely dead, i had to boost the start batteries and this time i started the gen set and let everything run for an hour, got the volt meter out and all the batteries were getting 13.58 volts. Again was happy so shut down the switches and checked to make sure that even my inverted was in the off position, 24 hours later all was dead, dead again. i have a major drain, where do i start?
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Old 09-12-2019, 05:53 PM   #2
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First and foremost the volt reading you got after the short charge , is a " surface charge ". Or if the genset was still running , all you saw was converter/charger output voltage. To get a true voltage reading the battery must rest for at least an hour , to allow the surface charge to dissipate.
Dead batteries would take 8+ hours to charge from the alternator and two to three times that running the gen set.
Before you go chasing an issue that might not exist .
Remove the batteries from the coach , and have them fully charged and load tested .
More info in this link.

The 12volt Side of Life (Part 1)
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Old 09-13-2019, 11:12 AM   #3
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Yep, if your batteries are low or dead an hour of charge isn't doing much. Those diesel batteries are big and need a lot of voltage and time to charge them up. Once they are "dead" they are damaged. Two or three times and you are really damaging them. If it's a flooded lead acid battery you can try an equalize process to try and revive them but it depends how badly they are damaged. You should not try and equalize other battery chemistry types.
may just be time for a new one IMO
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