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i was playing some music(amp), switched off & couldn't start. battery was dead. a good samaritan took out his battery to give me a start but may have reversed polarity before correcting this mistake(did not see.. but suspect) the car started but cut off after a minute. Borrowed a battery and drove home(night time). by the time I was home the battery was dead but no batt/alternator light came on dash. What can be wrong?
 

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i pwn your mom
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could be a possibility that your systems is draining the battery and causing your alternator to have some problems.. replace the battery and go to autozone to get your alternator check out..
 

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Now w/20% More Magic
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trying to charge a dead battery with a alternator will quickly cause failure to the alternator but do what PsuLemon said
 

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If the battery's truly dead it makes sense you wouldn't see any lights on the dash about alternator/batt. My guess is your alternator is fried.
 

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2018 Nissan Pathfinder SL
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MagicPie said:
trying to charge a dead battery with a alternator will quickly cause failure to the alternator ........
I do not believe this is true.
An Alternator self current limits, the controls are only on voltage. (hence voltage controler.)
The rebuilt for my daughters SER had a load vs rpm chart showing full load up to and at max rpm.
This is a major difference with the old generators that had both current and voltage controlers. If the controller went bad you lost the generator and/or battery.
So if an Alternator charges a flat battery, which it will every time one of us needs a jump start, the current will limit at the max design current. You cannot exceed the design current of the Alternator.
However I agree if your Alternator is old and has defective parts a full load may finish it off.
Good Luck......
 
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