I have an ATC 70 that I managed to get running a year ago after replacing the coil and filing points. Machine sat since last fall and got it running again and then it just quit and now does not fire. Filed points again and still no spark. I have connected to the black wire coming from the ignition and grounded through my Analog ohm meter and get nothing even while rotating engine. The other three wires in the harness all show uninterrupted continuity. Does this show that my points have failed or is it the stator coil? Other question is whether it would be a good idea to replace with an electronic conversion? I have done some searching here and only find a limited number of related posts and they are several years old. Appreciate any input and thanks, Walt~