Terex t230 thottle stopped working at crane cab., help!
Check alternator. If the voltage drops at all the upper throttle is the first to quit working.
I found out my cab throttle won't work in my 30 ton National, if I don't have the parking brake applied in the truck cab, there is an electrical interconnect of some kind. This is a good thing obviously, and yes, I found this out on dead level ground, while stuck actually in a pot hole.