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Old 02-09-2014, 11:19 PM   #1
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Dead batteries

Motorthome was in storage for about a month in very cold winter temps, disconnect engaged on both banks of batteries. Checked battery status today.... house batteries still 98 percent charge, chassis batteries 30 percent . The only parasitic discharge would have to be through the small wires that are directly attached to the terminals. I believe one is for the engine computer not sure what the others are for. The batteries are new and I recharged them back to 100 percent today with an external charger... ( took approx 8 hours ). Any thoughts on what the parasitic discharge could be? or is it possible that these batteries simply cant handle cold weather?
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Old 02-10-2014, 04:06 AM   #2
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Not only your ECU, but radio memory, electric steps, clock, etc. can discharge the battery over time. If you disconnect the negative terminal, or use a switch like this:


You might have to let the ECU 'relearn' your driving habits when you hook it up again.
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Old 02-10-2014, 08:40 AM   #3
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Having all those items directly hooked to the battery kind of defeats the purpose of the battery disconnect However one of those items must be drawing to much power. I think I will take your advice and disconnect the ground terminal. The computer can join me in re learning how to drive in the spring

thanks for the feedback......
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