Well I got it started and left it idling while I looked for the ground cable, which i wasn't able to locate. I took off the plastic cover from passenger side and just saw the air pump. Do i have to take the wheel of to get to this cable?

While i was doing that, the car stopped. I checked the voltage and it was at 5v. Is my battery bad, not holding charge or you guys think it's the alternator?

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2011 35d