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Q: why does isnt my battery charging. Have new alternator and batt. on 1991 Mazda Protege

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I have replaced the alternator and the battery.the battery has been replaced twice within the last two days.
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Check the 80 Amp "Main Fuse" large blk/wht wire at Alternator should have Battery voltage all the time,as should wht/red, black wire is ground, smaller white/black goes to the dash warning light to turn it off when the alternator starts charging.
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