I have a 1971 7.5hp Merc. I can only get it started when it is in gear so that it will throttle past the start position. There is no spark when throttle is in the start or less than start positions. It does not have the Phelon magneto ignition, it has the "other" ignition system. Wires are not frayed, and I disconnected the kill switch and grounded that wire to the block, any suggestions?