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My TC21 is doing exactly the same thing, except it doen't clunk it either gets a full 12vdc and starts or 0vdc and nothing happens. If I jumper 12vdc to the starter solonid it starts EVERY time. I'm waiting for a wiring diagram to get deeper into the diagnostics, meanwhile it is being started with a remote switch. It appears to me to be a faulty starter relay, which I'll try next. I'll let you know if / when I get it figured out.

TC33 won t start -- sometimes
New Holland Tractors
Replies 33 Post by wrs01a

anyone had a problem with a new holland tc21d with no power to the starter solonid in the "start" position? Ign Switch is Ok and starter works when 12vdc is jumped to the solonid terminal, also all the interlock switches on the PTO and L-N-H lever are OK. It appears there is a loose connection or a starter relay I can not locate unless I start cutting harness to trace the wires. I have a book on order hopefully it will have a wiring diagram.

tc21d no power to starter solonid
New Holland Tractors
Replies 3 Post by wrs01a