If you are having trouble with your cap sensor switch, here are a few things you can check:
228720
KIT:DURAMAX/DURAMAX HYAMP/MRT MACHINE TORCH CAP SENSOR SWITCH
428162
KIT:DURAMAX HYAMP HAND TORCH TRIGGGER START SWITCH REPLACEMENT
428156
KIT:DURAMAX HYAMP/LT HAND TORCH TRIGGER/SPRING REPLACEMENT
420172
SHIELD:DURAMAX HYAMP 45A/65A HAND
128639
PowerMax 1250 Cap Sensor Switch
220977
CAP:DURAMAX HYAMP
420156
CAP:DURAMAX HYAMP OHMIC
428278
KIT:DURAMAX HYAMP LONG TORCH 45° FRONT REPLACEMENT
228608
KIT:ARCGLIDE CABLE BREAK-AWAY SENSOR Prox Switch
059520
DURAMAX HYAMP 180 DEGREE MACHINE TORCH ASSEMBLY 25'