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Charging two battery system
OK this might be a dumb question. If so feel free to let me have it. My car has two batteries. Does this mean they are six volt batteries or twelve volt batteries. I used to be able to remember the whole thing about "wired in series or parallel" but it eludes me now. If they are six volt how would I charge them when not installed in the car? The batteries are made by Interstate and have the following ID #s on them; U911-50 300CCA. I just pulled them out today after having the car in storage since mid December. I didn't bother checking if they would turn it over as I have some other stuff to do before that.
Mike
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Mike. 1972 911T, non-sunroof coupe. |
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04-01-2006, 01:47 PM
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Join Date: Apr 2002
Location: Clinton, NJ
Posts: 12,782
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They're 12 volt batteries
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______________________________ Dave 1969 911T Coupe 1972 911E Targa |
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04-01-2006, 01:57 PM
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Thank you. In that case if I were to jump it with booster cables I could attach both cables to the same battery. I'm not sure that will ever be an issue but you never know.
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Mike. 1972 911T, non-sunroof coupe. |
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04-01-2006, 02:13 PM
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Join Date: Apr 2001
Location: Linn County, Oregon
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If they are the old liquid lead acid type, it's easy to determine voltage by counting the filler caps. 2 Volts per cap. Anyway, when hooked up properly, the early 911 twin batteries can be charged together as a single 12V battery...
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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04-01-2006, 02:14 PM
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Yes, they have six filler caps each. And I now remember being told that years ago. The batteries are actually fairly new (2002-3 I think), the prev. owner put them in. Should I switch them from side to side or does it make any difference? I will have owned the car for a year in June so this stuff is still new to me.
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Mike. 1972 911T, non-sunroof coupe. |
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04-01-2006, 02:23 PM
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1972 Porsche 911T 2.4 with Webers
