For some reasons Thresholds have had a history of off/on switches problems. I had a 400 A and that's how i leaned to solder. They would supply the the switch. My 4000 has been modified so the switch can be done with spades.
Threshold S/300 STASIS problem with on off swicht
POWER ON OF SWICHT OF MY THRESHOLD S/ 300 IS MALFUCTIONING.
SOMEBODY HERE CAN HELP ME FIND A REPLACEMENT