Lets cut to the chase.
Get a long jumper wire. Attach one end to the Battery (+) positive terminal.
Using the diagram I previously posted, turn on the PTO & Ignition switches.
Take the other end of the Jumper wire and starting at the PTO Clutch connector, touch the wire at each device terminal as indicated, until you find an absence of power. BINGO.....you have your culprit.
REMEMBER, a DVM can indicate power but NOT amperage. There may be enough power to satisfy your meter but under load, it can disappear.