How do I install an extra battery in my car?

Can I add a second battery to my car?

It’s perfectly safe to install a second battery, provided that you follow the right procedures for wiring and battery placement, but it won’t necessarily fix your problem. … A second battery will power these accessories without draining the primary battery, which your vehicle relies upon at start-up.

Can you run two batteries one alternator?

You can run two batteries on the same alternator. … The alternator registers these two batteries as a single large battery and charges them the same. The batteries self-regulate the amount of current they take as they charge. This means that a single alternator is effective for multiple batteries.

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