If the diode went bad it would drain the battery if it was shorted or the alternator would not start to charge if it was open circuited.
At this point you don't need to worry about the alternator wiring. Check for voltage from the starter. The wire from the starter goes to the ammeter. From the other side of the ammeter it goes to the key switch, the push button switch, and back to the S terminal on the solenoid. If you have power through that circuit it should crank. Since it will not crank from the push button I think you will find the problem in this area.
There is another wire that goes from the key switch to the resistor by the ignition coil. There is a wire from the other side of the resistor that goes to the coil. There is another wire on that side of the resistor that comes from the I terminal on the solenoid. This is the wire that bypasses the resistor to give the coil more voltage for starting.
The last wire goes from the other side of the coil to the distributor. When the points are open this wire should have battery voltage. When the points are closed there should be no voltage on the wire.
If all the wires have the correct voltages and you still have no spark, the problem is in the secondary side of the ignition system. Those parts are the coil, rotor, distributor cap, plug wires, or spark plugs.
This post was edited by Owen Aaland at 19:28:23 08/15/13.
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