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  1. 07-23-2021, 10:48 PM #9
    larry_arizona's Avatar
    larry_arizona
    larry_arizona is offline Senior Member
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    Default 2020 Alternator Issues

    You are not supposed to run in 1+2.

    Recharge fully and use only 1 or 2.

    If you run in 1+2, the alternator can’t keep both batteries charged.

    Check you owners manual. The 2020’s were wired differently and recommended using 1&2, but 2021 changed back to how it was before.

    Perhaps your dealer used the 2019 battery hookup method.




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    Last edited by larry_arizona; 07-23-2021 at 10:56 PM.
    2021 Supra SA 400
    2018 Supra SA 400 (SOLD)
    Michigan
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