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battery losing voltage when parked 200 1990

Hello again.
I have an electrical problem where the battery voltage is 13.5 with the engine running (thanks to a new alternator, newish battery) but when I shut it off it drops to 11.5, barely enough to start it again. And then the next morning it's always back down to 10.5!

Nothing really remarkable about my electrical system except that there's no driver side headlight (anyone got one for $40 or so?) and my blower motor is on the fritz. And I think I have a bulb out somewhere. But I pulled the fuses for each of those things, and still the voltage drop.

To get around this I've been using a battery tender. It's the first ever 240 plug-in hybrid! But seriously, this is pretty inconvenient.






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