Good afternoon,
Leaving the key on could cause points damage and the coil. It would pit the points but not burn them.
Leaving the key on can absolutely burn out the coil. I've replaced many in classic cars for that reason as have others I know.
Hard to say who is at fault here. The points are a simple replacement. Did he try that first to see if it just the points?
Roy
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Tuesday, April 16th, 2019 AT 3:17 PM