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Go to TSC or your Friendly Local AGCO/Massey-Ferguson Dealer. I bought a new ignition from AGCO/M-F for about the same price as an aftermarket one. Here is how you change out the ignition on one of these babies (I did it last May) You have to disconnect the wires in the back from the ignition switch (its either a plug or three tabs - depending on how old your wiring is when I did it back last May, I replaced the entire wiring harness.) After you've taken off the wires, and marked what pole they go into, find the appropriate sized socket and loosen the retaining nut that holds the assembly into the dash. Reverse above directions, and the ignition has been replaced. You didn't specify what model year and its serial number - until you find those, I can tell you that the ignition and switch changed after on diesel MF 135s after SN 383XX which would place the cut off in the 1968 model year. You can find the SN plate on the LEFT hand side of the dash next to the ignition switch on a plate that says MF...with a whole bunch of patent data on it. Also, as stupid as this sounds, make sure you get a copy of the parts manual for it (if you don't have it of course)- they are both on Ebay and from MF-AGCO at a reasonable price. I bought mine at the same time when I replaced the ignition, but my point isn't to pontificate, it has a excellent diagrams of how things are supposed to go together - which will help you with this project. If you end up having to replace the Ignition and Key, the key is around 8 bucks and the igntion is around 25 so you're looking at around 33 bucks to fix this. I hope this helps, as I've learned the hard way with my MF 135. Its a great tractor! Christos
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