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Originally Posted by DASHADO
Not knowing much mechanical...is a dead alternator going to give you the inability to start the car even if you boost it??
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Altenator dies car is dead you can't jump nothing you are DOA(dead on axles). And don't ever run the car with the battery cables disconnected, that is old tech, these cars you can fry the PCM..
Sounds like you are A) not driving it enough B)have a power drain, sound system, alarm system, Multi-function switch that is letting power through C)even a bad cell in the battery.
Whirring sound - Hmm sounds like the fuel pump coming to life. Confirm this if you have enough juice, leave drivers door open, turn key to "on" and listen. You should hear it prime the system. On a normal it would whir then kinda stop you turn the key and it starts.