Do not quote me on this.....
I might still have the old FFR A2 switch - it was the mosfet unit that blew
4 wires to 3 switches - trigger, col & one at back detecting semi/auto selector plate
it feeds one common wire which then feeds back a signal or closed circuit
Telling the ETU mosfet what switch/circuit is open/closed etc....
Well I tested with a continuity test meter dooberry 2 reds + 2 black wires
4 wire connector lead red,black,red,black or something like that
yup one supply & 3 return signals
I was trying to see if some other fet like the cheetah or something could work for dead ETU guns
but cheetah is old/OOS and just gave up going back to old school style trigger
Mosfet blew, but afaik the ETU switch and 4 wire loom was ok still
I last saw it about 6 months ago and tbh I'm not sure if I slung in one of many boxes
Or finally decided to chuck it in the bin
Tried to give you as much info as poss, I can look for it over this long weekend perhaps
Only don't hold your breath in case I finally did bin that pile of junk ETU leftovers I had