If the mosfet is connected the same way as mine the two red wires are soldered to the one contact which kinna bypasses the switch. the 3rd wire puts the mosfet into the equation making it the switch :-/ (I think that's right anyway) you might have to rewire the trigger switch to put one red wire onto each individual contact.
As for the other problem, no idea sorry if it is a V2 gearbox you will have to open it to get to the switch so you could investigate while it is open.
As for the other problem, no idea sorry if it is a V2 gearbox you will have to open it to get to the switch so you could investigate while it is open.