My car stalled on me three times yesterday, I had noticed before this happened that the light's in the dash, and headlights dimmed when I would roll up the power windows. My turbo timer kept turning off by itself too. Do I need to check my batteries positive to see if it is making contact? (By the way I lost that washer/nut that tightens the cable to the positive side of the battery, do you think that can be a problem?) Any help would be appreciated... 