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Re: Can a jump start kill your starter?
Cliff notes: No,.............. unless you hooked up two batteries in a series circuit, resulting in 24 volts. (Note that normal jumper cable hook up is a parallel circuit.)
IMO it may not be the starter. Do a load test and voltage test on the battery, to see if its weak.
It is possible for a worn starter to have an internal short (dragging armature) that draws too much power form one battery to crank the car, but will start the car with 2 batteries hooked up.
This situation will produce the results you describe and will require a replacement starter.
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