One problem related to battery cable has been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
The headlights & dash lights flicker & go out while driving at night time , no weather being a factor & no other things either. Other people exp. The same prob !!!! the voltage meter is dropping during this period also . Have had back to dealer they tightened the battery cables & also put pads behind the cables this was not a fix !!!!!!! what can be done to fix this major problem safety!!!!! this happens almost every time you drive and the lights are on!!!!!!.