Hi Mark
I guess were both in the same boat I'm not an electrical engineer by trade either.
Doesn't it seem as though there should be a change-over in the welder to interrupt the ramp up-down and the Amp adjust knob on the unit? Of what I have read those are disabled while using the pedal. doesn't that reflect on the pedal as the selecting member? and the welder is the change-over controller? Using pins 6+7 in the pedal connector (they are tied together).
I'm just a commonsense guy, even though commonsense isn't common anymore!
Thank You for the help
dwdw