Alternator not charging batteries??
#812450
09/23/10 09:59 AM
09/23/10 09:59 AM
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Joined: Jun 2010
Posts: 80
South Shore MA
67GTMIKE
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South Shore MA
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Big block, elect water pump and fans, duel batteries in trunk, running in series. I had a single wire 90 amp alternator installed and it is not doing crap. Tester shows it putting out amps but, it does not appear to be charging batts. My Volts gauge showed about 14 volts, after driving 15 minutes, it was down to 8 volts. Any suggestions, not used to having duel batteries, am I missing something? 
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Re: Alternator not charging batteries??
[Re: terzmo]
#812454
09/23/10 10:09 PM
09/23/10 10:09 PM
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Joined: Jan 2003
Posts: 5,445
So Cal
Sinitro
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So Cal
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Quote:
two 12 volt batteries in series is like one 24 volt...why are you running this configuration ??
People upgrade the alternator to support electric fans and such....you have a 12 volt output supporting a 24 volt system...again....why ??
As mentioned (2) 12V batteries in series equals 24V, instead the batteries should be in parallel for double current but @ 12V. The alternator assuming it is a standard Mopar one can only charge 12V batteries.
Just my $0.02... 
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Re: Alternator not charging batteries??
[Re: terzmo]
#812459
09/23/10 11:07 PM
09/23/10 11:07 PM
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Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
OzHemi
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Penguin-hating Ginger
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Posts: 104,346
Garden Grove, CA
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Quote:
two 12 volt batteries in paraleel will only deliver 6 volts
Ummm, no....2 batteries in parallel will still have 12 volts.
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Re: Alternator not charging batteries??
[Re: Supercuda]
#812463
09/24/10 12:34 AM
09/24/10 12:34 AM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
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Aurora, Colorado
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I hope you guys are just joking around or this is just sad  Two 12-Volt Batteries in series is 24-Volts, double the voltage, but same current rating as one one battery. Two 12-Volt Batteries in parallel is still 12-Volts, but twice the current rating. If your running an alternator you usually only need one battery to get the car started then the alternator takes over to power the car and recharge the battery. The dual batteries in parallel gives extra current capacity to maintain the 12-volts longer when there is no alternator to supply power. Dual batteries are used in Diesel trucks because the starter motor operates on 24-volts, where the batteries are temporarily connected in series, but charged individually through a battery isolator. HD non-diesel trucks that have dual batteries will charge the batteries through an isolator, but the truck basically is operation on just one battery with the second one in reserve for things like wenching.
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Re: Alternator not charging batteries??
[Re: terzmo]
#812464
09/24/10 10:36 AM
09/24/10 10:36 AM
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Joined: Feb 2003
Posts: 8,679
Andrewh
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Quote:
two 12 volt batteries in paraleel will only deliver 6 volts
voltage does not work that way.
Resistance in a circuit works that way.
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Re: Alternator not charging batteries??
[Re: Andrewh]
#812467
09/27/10 10:51 AM
09/27/10 10:51 AM
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Joined: Jun 2010
Posts: 80
South Shore MA
67GTMIKE
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South Shore MA
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Thanks for all the replies.. The 2 batts are in series and shows just under 14v on my volt gauge when charged, car is setup with large fans, elect water pump, stereo system, ect.. so I assume that is why the extra battery was installed. I installed a alternator, so I would not have to charge the batts manualy anymore. For whatever reason the vbelt was defective. I picked up another and everything is working perfectly now. I thought I had done something wrong but it was just the belt. Thanks again- 
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