What is the problem when gauges are erratic up and down? on 2004 Chevrolet Trailblazer

I got a new battery and checked alternator

by in Broomfield, CO on January 18, 2013
2 answers
ANSWER by on January 19, 2013
maybe there is an electrical issue
ANSWER by on January 21, 2013
Ihad an alternator installed but now the check gauge come on and and the battery gauges drop all the way down whwat you yhink the problem is?my truck is a 2002 dodge dakota 3.9 engine

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