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2005 light pulse

Tsassman2000

New Member
Joined
Jun 24, 2020
Messages
2
05 avalanche 2wd. Over last year or so noticed head and interior lights pulsing to and now is very noticable. In December 19 had a voltage system failure come up on dash but if shut truck off and restarted it would go away for a bit. Had tested 4 times and turned out bad when this warning was showing. Then yesterday it came back on and turned out to be battery. Replaced and had alt checked because this came up again. All the time the voltage on the dash will constantly fluctuate up and down. Insee this problem about pulsing lights but no one ever post if they found the problem. The truck is completely stock.
 
Could be the AC compressor cycling.
 
Would a bad ground cause the pulse from the compressor? It is a common problem that no one seems to post the fix for. Any help would be awesome.
 
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