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What is the problem when gauges are erratic up and down?

(2004 Chevrolet Trailblazer)
in Broomfield, CO on January 18, 2013
I got a new battery and checked alternator
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Popular Answer
on January 19, 2013
maybe there is an electrical issue
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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