With the points closed, the negative side of the coil is grounded. It's impossible to have enough power to light up a test light at a "ground" connection. (Unless somebody repealed Ohm's Law!)
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!