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make sure engine is idling at proper speed also
should be around:
GM V6: 625-675rpm
Diesel: 725-775rpm

once confirmed and alternator still not charging at idle THEN you can check belt tension and tighten as needed.
Pay close attention to pulley on alternator and condition of belt, if belt is worn or pulley on alternator is worn it could slip and cause this issue.

good luck
  • Posted 12 Jul 2012 21:11
  • By Jplayer
  • joined 12 Apr'07 - 407 messages
  • North Carolina, United States
John Player Jr
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LiftOne, LLC
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Email: jplayer@liftone.net

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