Todd,
Here is my 2 cents worth. I only have a rough schematic of the 318 but it looks to be wired with both a safety circuit and a PTO power circuit. When you say there is power to the switch what color is the wire you are testing? It appears that a purple and yellow are connected together at the PTO switch (this is the safety interlock circuit) and there should be 12v there. There is also a blue wire from the time delay module. The blue wire provides power to the PTO. Is there power at the switch on the blue wire? If not, then the time delay module has shut power off for some reason. The first thing that comes to mind is the seat safety switch is open. Check power at the seat safety switch by unplugging it and see if you have 12 volts at one of the terminals on the connector. Power to the seat safety switch comes directly from the key switch. Let me know what your results are. There are others things to test and I can walk you through until we find the failure.
I just went through an odd problem on my 322 and it ended up being a short in the wiring harness. Hope yours is easier.
Let me know what the tests indicate,
Bob
Here is my 2 cents worth. I only have a rough schematic of the 318 but it looks to be wired with both a safety circuit and a PTO power circuit. When you say there is power to the switch what color is the wire you are testing? It appears that a purple and yellow are connected together at the PTO switch (this is the safety interlock circuit) and there should be 12v there. There is also a blue wire from the time delay module. The blue wire provides power to the PTO. Is there power at the switch on the blue wire? If not, then the time delay module has shut power off for some reason. The first thing that comes to mind is the seat safety switch is open. Check power at the seat safety switch by unplugging it and see if you have 12 volts at one of the terminals on the connector. Power to the seat safety switch comes directly from the key switch. Let me know what your results are. There are others things to test and I can walk you through until we find the failure.
I just went through an odd problem on my 322 and it ended up being a short in the wiring harness. Hope yours is easier.
Let me know what the tests indicate,
Bob