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Q:

how can I trouble shoot the coil pack and the electric going to the coil pack. on 2003 Chevrolet Express 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Meaning how could I check the wiring harness.
(2) Answers
(1) Comments
No fire at all on any cylinder? If only one cyl. misfire, swap that coil with another one to see if misfire follows coil.
check for spark
I have no spark I want to know how to check it back to a fuse