This problem is similar and I am out of things to try.
I am new to this forum. I have a 2002 New Holland TC35D.
For some time it has been acting up. It would make a clicking noise while attempting to start it. I would fool around with the PTO lever and it would start after a few hours. I bypassed the switch and it worked fine for a year or so. Now it has started it again. It will not light up at all. I have bypassed all the safety switches, no help. I have check the ground circuit, it appears good. I have changed out/rotated all the relays, no help. I found the starter to be bad, I have a new one on order.
However, even with the ground wires connected, it will not light up. Now here's what's confusing me. I can remove the ignition switch, it checks good, then short across the power in wire to the fuse bus wire and it kills all voltage. I have disconnected the alternator, bypassed all safety switches, and it still does it. I pulled all the fuses and replaced them one at a time to isolate the circuit. Fuses 2, 4 and 5 each pull down the voltage to zero. 2 is is safety system, fuel and cruise, 4 is instrument panel and lights, and 5 is alternator excitation, cruise relay and hi, low, shift. I have the wiring diagrams and cannot find anything in common other than power in and ground.
Since the starter shorted out, I am thinking I may have multiply bad relays, which I don't know how to check other than replacing or rotating with like ones. I read somewhere in this or another forum about a resetting circuit, but don't thing this one has one, or at least I don't see it in the diagrams.
Sure could use some help here.
P.S. The fuses do not blow.