Jon, most people don't take into account the fact that before the inductive reactance of the primary winding kicks in to limit the current, Ohm's Law says that 12 volts applied to a 1/2 Ohm coil resistance produces 24 amps of current flow for a fraction of a second. Bump that figure up to the 14.5 volt normal output of a charging system takes that momentary current to 29 amps. No wonder ignition switch contacts fail! The laws of physics are not "suggestions"!
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!