Begin by pulling both battery cables and do a thorough cleanup with a wire brush or a dedicated "battery post cleaner". Your local parts store will have one on the shelf, and it's something every stovebolter's tool box should have. Pay specific attention to the inside of the cable terminals. If the points happened to be closed while the ignition switch was on, they're toast now. Inspect and/or replace them and see if the spark comes back. If the coil didn't overheat and boil the oil out of it, chances are that it's still in good shape, but points simply won't tolerate more than a few minutes of "ignition on- - -engine not running". Also check to see how much voltage is at the battery posts (not the cable terminals) during cranking. 6V systems should not drop below 4.5 volts with the starter cranking the engine over for 15-20 secnds with the ignition off, and 12V systems should crank for the same time at 9.5 volts or more.
Jerry
