I have a 1968 142 with power to the coil, but no spark. I have thrown all the usual parts at it : new points, condensor, cap, rotor, and coil. My Haynes repair manual says to check for battery voltage at terminal 50 at the starter solenoid and at terminal 50 at the ignition switch. I have no voltage at either terminal. I even replaced the wire to eliminate that as a problem. The repair manual just says to check the wire for breaks and bad connections, but does not elaborate on anything else. Terminal 50 is the switch input, and the yellow wire from switch to coil is the output and I have voltage there, but my alarm also went nuts, and it is spliced into the yellow wire. The alarm has been disconnected. Is it the switch? I can come to no other conclusion. Any help is much appreciated!!!