Looking to see where to go look first to fix
as everyone here says you need to post the serial number of the machine and then Nige will help you with a wiring diagram.. depending on a few factors if the failure is in the switch on the joystick it's going to get expensive as you can't just replace the switch.. at best just the handle.. at worst the entire unit.. my 304 thumb will get intermittent every 6 months or so for a day and then it fixes itself... hard to fix when it doesn't stay failed
Serial# CAT0305DEXER01668 Engine does idle up when thumb switch is engaged.
Does not idle up