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hey my battery charger is ass slow, and i know my alternator COULD do a better job.. can ihook a jumper cable to the pos and neg of a battery and let it charge it? is this safe? and can i do more then one battery i have [email protected] or just one at a time?
 

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your alternator will only charge 12 volts so you would have to charge them one at a time or wire them in parallel but then you would just be wasting gas charging them. You should buy a street charger it is a little expensive but it is worth it if you drive your car a lot.
 
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