One problem related to alternator/generator/regulator has been reported for the 2005 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 1500 based on all problems reported for the 2005 Sierra 1500.
Charging system failure message keeps coming up on vehicle. . . Replaced alternator three weeks ago and it seems to solve the problem. . . For a while at least. . . Two nights ago truck died. . . Replaced battery with a brand new one yesterday and truck is still sitting on the side of the road as battery is not getting charge from alternator.