I have a 2007 new holland tc 30. The power take-off light comes on.I’ve passed ALL the safety switches (I think).I installed a new safety relay.Sometimes the PTO light goes out randomly and the tractor starts.Then it turns back on.The power take-off is not connected.
If bypassing the switches doesn’t help, then the problem is probably a bad connection or damaged / corroded wiring.Thoroughly inspect the wire harness.It would be a good idea to test the wiring with an ohm meter for continuity.