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My MF-135 did that once while I was traveling the 8 miles from farm to home. I stopped for gas. I took the end off the starter and found the brush leads all broken and the brushes worn about out, leaving a pile of coppery carbon in the bottom of the starter. I was able to connect two out of the 4 brushes and get it to start. When I got it home, I pulled the starter and had it on the counter of my local automotive electric shop while it was still warm. I had them put in brushes (which means turning the commutator), bearings, a new solenoid, and a new Bendix drive. Its worked fine ever since at least a dozen years. When there's just a click, battery post connections are most suspicious. Resistance in a connection (which can be at other points in the starter wiring, like grounds and posts on the solenoid) will let the solenoid pull in to make the click, but drops the voltage so far when the contacts make that the starter won't crank the engine. Under some conditions the solenoid then drops out, the voltage rises and it pulls in again chattering. Just from bad connections, but a nearly dead battery will do the same with good connections. You have to eliminate the possible problems going from simple (dirty connections) to the complex (or expensive, bad starter) until it works. We can't test it remotely. Gerald J.
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