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My HDS2135 will start but the PTO won't engage when the knob is lifted. also no lights, and it won't shut down when awitch is turned off. I have to pull the plug wire to shut down.

Test PTO & Ignition Switches with multimeter or test light.

I replaced the ignition switch with no success,because it appeared to be the only common point for all three issues, those being:
(1) The PTO won't engage; (2) The lights won't come on; and (3) While the tractor will start, it won't shut down without pulling the plug wire.

If anyone has suggestion I am open to it.

Sounds like a blown ground fuse.

See shut down circuit page 108 in your manual above. Troubleshooting is section 4.1.

StarTech said:

Sounds like a blown ground fuse.
View attachment 67345

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Thanks Marc, the issue was a ground wire Thanks again.