Yes, check the voltage drop. Put meter on battery cables, if the battery drops below 19v (24v battery) or 29v (36v battery) when trying to lift or travel, the truck can instantly die. The K1 relay will stay on at 19v/29v, but will most likely drop out at 18.9v/28.9v. When was the last time the battery was watered?
Does it do it only when traveling or also when raising. If both check key switch and relay on dist. board voltages to see if voltage is dropping more than 4 volts when trying to do work. If only with one or the other see if you have voltage to frame when moving handle that is not there when at idle
double checked wiring all good, code of 832 has repeated a few times, battery has been charged.
Power it up and see what service codes you have. Then I would quickly check the ED switch and wires (red button on top). Moving the multitask handle could move a broken wire off of the ED switch