Would leaving the ignition on cause damage to the coil?

[29Cabriolet]

Originally Posted by cpf240

Not really, only cuts power to the ignition system.

A true cut-off switch breaks all connection with the battery.

Agreed! Found this out the hard way. My starter failed when attempting a start and with the key off kept cranking until I grabbed a wrench and disconnected it! Needless to say I installed a kill switch along with the repaired starter.