alternator light stays on2000 v.w jetta

2000 VOLKSWAGEN JETTA
120,000 MILES
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HERBSJETTA
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alternator light staying on had Battery and alternator both checked had replaced them both about 1 year ago from Napa now light comes on but all the time after both were checked light went off now after a month has passed it came back on!
Jan 6, 2012 at 8:12 PM
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FIXITMR
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maybe they need checking again? have you tested voltage at battery while light is on? and rev it to see if voltage goes over 15v?
Jan 6, 2012 at 8:22 PM
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HERBSJETTA
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ok i will go check this now
Jan 6, 2012 at 8:34 PM
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HERBSJETTA
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it does not have 15v when light is on and i rev it up!
Jan 6, 2012 at 8:56 PM
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FIXITMR
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what is the voltage? are there any issues with battery running down?
Jan 6, 2012 at 9:16 PM
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HERBSJETTA
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yes the battery runs down if light stays on! this morning light came on i removed alternator and had it checked was ok batt was ok.present voltage is 12.5!
Jan 6, 2012 at 9:30 PM
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FIXITMR
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well, it's not charging obviously. i wonder how taking it out and replacing it worked last time? are the plugs/connections clean?
Jan 7, 2012 at 8:21 AM
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FIXITMR
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cause it sounds like it's not getting the signal voltage to turn on from ignition.
Jan 7, 2012 at 8:34 AM
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F4I_GUY
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Check the fuse block ontop of the battery. The alternator cable/fuse/fuse block always short out.
Jan 9, 2012 at 1:51 AM