If I install a second battery utilizing an isolator, do I still need to upgrade my alternator?

Asked by Apr 12, 2016 at 02:39 PM about the 2010 Subaru Forester 2.5 XT Limited

Question type: Car Customization

The vehicle in question is a 2010 Subaru Forester (non-turbo).

1 Answer

3,940

No. It'll just take longer for the OE alt to fully charge BOTH batteries if they are allowed to run down. Remember, a car can run on a tiny motorcycle battery, as in racing apps.

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