PTO won't engage on a 5 year old gt52xlsi with 95 hours. the clutch shows 3.3 ohms. good continuity on and off at the switch itself, changing active terminals as expected. when i start the mower with the switch off, sometimes the PTO warning light comes on immediately, other times it only comes on once i pull the switch to try to engage the PTO. in either case it then stays on even when the switch is then turned off... all of which makes me wonder about the seat switch.
i don't really know how to trouble shoot the seat switch, and those are the only components i can point to as possible problems. i had noticed that over time the PTO engagement became more and more labored and hesitant, like it really wasn't happy about spinning up but then would run well enough. it also gave me a final warning when it failed to engage one day, then worked again, then stopped altogether.
The resistance only indicates whether the coil has a shorted winding or if it has opened up completely. I suppose another possibility if the gap is okay would be the coil is not getting full voltage supplied to it. That could be caused by anything from a bad ground to the pto switch itself again being suspect.
doesn't appear to be the clutch. bench test shows a nice, big "click" activation.
swapped out a new aftermarket PTO switch, so it doesn't appear to be that either.
i don't know how to test the seat switch. it seems to work as far as recognizing whether i'm sitting on it or not for the purpose of starting the mower, but i don't know how to test for its emergency PTO kill function - which seems like a possible culprit given the fact that it's showing me the blinking PTO light as soon as i start the engine, regardless of the position of the main PTO switch.
a short somewhere in the wiring to either the seat or the clutch
something in the central XLS*i* switch panel, shown in the first post above.