As posted it sounds like you have a battery issue. You can have a "fully charged" battery showing on a tender but until you do a load test on it you wont know for sure. You could have 12.8VDC at the battery but it could have enough sulfate build up the CCA has dropped from say 400 CCA down to 100 CCA and that is no where near enough to spin a starter over on a big twin. Hopefully the battery solves your issue. As for the PCB board it could be a couple of things. It could be a loose connection between the header connector and the terminals on the PCB itself. If your careful you can extract each terminal, one at a time, out of the header connector. This is done by taking the same paper clip and in the top window of each terminal on the header connector, pushing down gently the bend in the lock tab. Then take the extracted terminal and take some needle nose pliers and gently squeeze the terminal to slightly bend in the side of the terminal to tighten the connection. You also might have one of the four mounting screws shorting out part of the board. Vibration over time on the mounting screws might of caused the board to wear around the mounting screws and the internal traces in that board pass really close to the mounting screws. I like to take liquid electrical tape and with the pcb removed, add a nice thin layer around the mounting holes. Let it dry then reinstall the board.
As for the paper clip test you can use it on all your inputs there at the PCB. Take the paper clip and jump the black to the red. This will turn on the LED on the EHC to show ignition power out. At the same time it will turn the red LED on the ignition module. Unless its a 2004 then it depends on where the cam sensor is positioned at and might not show a red LED until you hit the start input. Anyways, after jumping across the red wire and getting the appropriate LED's illuminated, then you can jump across the black to the green. This will engage the starter as long as you stay jumped across the two wires. You can also jump black to brown to engage your turn signal, black to orange to engage your hand brake input and black to blue to turn the ignition system off. You can do the same on the left PCB. Black to white for high beam, black to yellow for low beam, black to violet for left turn signal and black to gray for horn if you ever want to confirm whether or not you have a PCB issue or not.
