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

5,710

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.

Your Answer

Subaru Forester Experts

  • #1
    Nick Eidemiller
    Reputation
    3,870
  • #2
    walth
    Reputation
    3,240
  • #3
    lifeson34
    Reputation
    2,720
View All

Related Models For Sale

Used Subaru Outback
392 Great Deals out of 35,031 listings starting at $199
Used Honda CR-V
736 Great Deals out of 57,132 listings starting at $1,200
Used Toyota RAV4
703 Great Deals out of 46,303 listings starting at $1,195
Used Subaru Impreza
199 Great Deals out of 20,694 listings starting at $1,950
Used Subaru Legacy
221 Great Deals out of 15,547 listings starting at $1,690
Used Toyota 4Runner
279 Great Deals out of 23,279 listings starting at $2,300
Used Toyota Highlander
456 Great Deals out of 31,156 listings starting at $2,500
Used Subaru Impreza WRX
41 Great Deals out of 1,295 listings starting at $3,999
Used Ford Escape
1,022 Great Deals out of 95,458 listings starting at $1,200
Used Honda Accord
983 Great Deals out of 59,478 listings starting at $1,099
Used Honda Civic
762 Great Deals out of 69,166 listings starting at $1,350
Used Toyota Tacoma
563 Great Deals out of 44,573 listings starting at $1,790

Used Cars For Sale

2018 Subaru Forester For Sale
25,441 listings starting at $19,791
2017 Subaru Forester For Sale
38 Great Deals out of 1,734 listings starting at $19,900
2016 Subaru Forester For Sale
48 Great Deals out of 1,124 listings starting at $14,400
2015 Subaru Forester For Sale
134 Great Deals out of 2,622 listings starting at $11,995
2014 Subaru Forester For Sale
34 Great Deals out of 1,086 listings starting at $9,990

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.