Hardee 3 pt sprayer trouble

My hardee 3pt sprayer control box quit talking to the sprayer. Box has power to it. Power comes from box, out the wires to plug to sprayer, but sprayer won't follow commands.
Is there a fuse on these sprayers? I don't have a manual-bought it used.
Still works when PTO is turned on and sprays, but I can't turn specific booms off and the master switch won't turn sprayer off-must use PTO.
Thought maybe someone on HT may own a similar model.

Hardee 3 pt sprayer trouble