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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF 135 Electrical Problem/Wiring Diagram?

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David A. Daneho

11-23-2007 19:41:00




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I recently bought a used 135 Diesel. The thing was running like a top until yesterday, when I stalled it out. I dropped the powerlift, put the gears in neutral and cranked the engine. It turned over, and then continued to turn over even when I released the ignition switch. It didn�t start and after that it was dead. I then tried to jump the battery and when I did, the jumper cables got real hot, real quick. I disconnected them and started looking for info on the electrical system. My guess is that there is a short somewhere, but I am now also concerned about the alternator, after the jumper cable incident. Where should I start? I'd think start at the ignition switch (cheapest!) and work back from there. I have a lick of common sense, but am not really a mechanic. Electrical systems are a weakness of mine in particular. If anyone out there has a wiring diagram, that would be a big help! Thanks in advance for any advice that might be offered!

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Holz Equipment Service

11-24-2007 19:06:14




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 Re: MF 135 Electrical Problem/Wiring Diagram? in reply to David A. Danehower, 11-23-2007 19:41:00  
There is a good chance that when you attempted to restart the tractor your starter stayed engaged because of low voltage in the battery, I have seen this happen numerous times. Sometimes you can smack the side of the starter with a hammer & it will release. Other times I have had to loosen the mounting bolts for the starter, or completely remove it to correct the problem. If this turns out to be your problem, make sure that the battery is fully charged before attempting to restart. I wouldn"t think that the alternator would be damaged, if so it would be rare. Good luck

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El Toro

11-24-2007 04:32:29




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 Re: MF 135 Electrical Problem/Wiring Diagram? in reply to David A. Danehower, 11-23-2007 19:41:00  
third party image

If your tractor has a starter solenoid it could be
the problem by keeping battery voltage to the starter's bendix which keeps the starter engaged.

You should only have voltage on the S terminal of the solenoid when you twist the key to start the engine. Hal

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