2004 Yukon 2500 intermittent start, dead door locks, dead windows - but rear mirrors & car seats work.

John.Spreitzer

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Orange County, California
Over the past year, we have had 6 episodes where:
The engine turns over, catches, but won't keep running (the head lights do turn on)
Door locks on the door will not work
Windows will not work
Factory remote alarm will not work

However, many things do work:
Rear view mirror adjustments from the door
Power seats
Interior lights

So far we have:
Replaced battery
Replaced the alternator
Removed, reseated fuse clusters from under and all fuses.
Removed, cleaned all 6 grounds
Had the car to 3 different shops, including one GMC dealer. The car worked fine upon arrival and no error codes were found.
Only 108,000 miles

Any ideas?
 
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