GMC Troubleshooting Questions? Ask a Mechanic for Answers
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your battery is very low at 11.6. should be 12.6 volts. it may not take a jump from the battery failure internally.
I would start by replacing the battery and then have the charging system checked to be sure the alternator is ok.
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the alternator is where you start. also, have the battery load tested to be sure it is not shorted internally.
how are you making out