Ok my friend has a 99 gt and recently he blew a plug out of the head snapped tge ignition coil everything. I fixed it and he told me that day the last time he had tried it the battery blew smoke when he tried starting it and it wouldn turn over after that. Well we started it just fine with my battery so he bought a new one thinkin that one was just bad and it ran for maybe a day and he blew that battery just the same. What would be causing this? He has had his starter and alternator both checked.
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