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i would start by testing the battery , i have seen cases where the battery was good enough to start the vehicle but was causing the alternator to do all the work resulting in premature failure. my f150 went through a brand new Ford alternator in 2 months .

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14y ago
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Q: If I'm on my third alternator in my 2000 Toyota Sienna in a year something is killing them what is killing my alternator?
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