Nick,
This could be a coil problem. And heat is a factor. Sometimes the
very fine wire in these coils can break. Yet it can still conduct
electricity when the wire is at ambient temperature. As the coil
heats up, the wire will try to expand, and when it does it breaks the
connection. Sometimes vibration will make the connection again but
most of the time the coil will not work until it has cooled
considerably.
Make sure the wires to the coil are in good order and are secured to
the terminals properly.
Good Luck Pat
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