Rig up an LED that comes on anytime there's voltage on the wire to the coil. If it stays lit with the switch in the off position, you've got a voltage leak somewhere. LED's draw a LOT less current than a regular light bulb.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!