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If the car is a 12 volt system, then you will want to connect the batteries in "parallel". IE: negative to negative and positive to positive. Because of "cranking amps" it would be advisable to use a cutoff switch when starting the car. (The switch would interrupt the power from one of the batteries so the amperage wouldn't toast the starter) Also, the alternator should be isolated as to charge the batteries one at a time.

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Q: How do you connect two batteries in one car?
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