2000 Ford Focus Battery not charging maybe?

2000 FORD FOCUS
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JPALMSSS
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Transmission problem
2000 Ford Focus 4 cyl Two Wheel Drive Automatic

Hi I have a 2000 Ford Focus and ever since I got my license its basically crapped the bed. I took it to my boyfriend's dad's shop and they replaced the alternator and such. When I took the car home after they replaced it my speedometer spazes out and goes from 10 to 140 and back again when I'm going 30? But it only happens if I turn off the A/C while i'm driving. Then one day I went to turn my car on and it didn't turn on. I tested it and it ONLY HAD 3 VOLTS!? And so I charged it over night and it started up just fine. I'm scared to drive it because I don't wanna go somewhere then be stuck there ya know? I mean is it the alternator? or did it just need some extra juice?
Aug 14, 2010 at 8:40 AM
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MMPRINCE4000
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Take to most autoparts stores and have charging system tested, this includes alt, battery, starter and drains on battery.

This is a free service.
Aug 14, 2010 at 8:45 AM