Member viking427 suggested that someone remove the epoxy that the diodes are encased in. I removed all the epoxy looking for a terminal to attach the positive lead of a NOVA II electronic ignition module. I lucked out. There is a terminal that obviosly is the primary lead to the ignition coil. I soldered a wire to this terminal and connected the other end to the positive terminal of the NOVA II module. Then connected the NOVA II negative terminal to engine ground. To my surprise, the engine fired up on the second pull and has been working perfectly ever since. This only cost me $15 for the NOVA II module. Not $225 for a replacement from TORO. My coil part # is 81-1990 The terminal under the epoxy is on the coil side of the cavity toward the flywheel. Good luck. It really works.