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Restoration & Repair Tips Board

Super M Electrical

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Freud21911

08-16-2007 06:14:47




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I have a 1952 Super M that has an electrical problem and won"t turn over. It is a 6V system. When I hook up the battery after a full charge and attempt to start it the battery cable end connected to the starter button gets hot, arcs, and begins to smolder. I have a red battery cable connected to the positive battery post which is grounded onto the tractor and a black battery cable connected to the negative post. Could there be something wrong with either my connections or a bad starter button?

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Bob M

08-16-2007 11:53:07




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 Re: Super M Electrical in reply to Freud21911, 08-16-2007 06:14:47  
Another possibility is the starter bendix has jammed into the ring gear which effectively locks the starter. And jammed starters are is not uncommon with the Farmall letter series as the starter drives get worn.

If the starter is jammed, when you hit the starter switch it's same as a dead short. Arcing, smoke, hot cables, etc. are the result.

A jammed starter can be freed temporarily by rotating the engine backward a bit (put the gearshift in 5th then push against the rear tire to rock the tractor backward - it'll only need to move a fraction of an inch to free the drive). Or simply loosen the bolts that hold the starter to the clutch housing, then pull back on and wiggle the starter until you hear a 'clunk'. Then retighten the bolts. The starter should now work again.

Note that if the bendix jammed once it WILL jam again - maybe not for for a while but eventually will. Only solution is to replace the starter bendix and possibly also the flywheel ring gear if it is badly worn.

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John T

08-16-2007 07:44:02




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 Re: Super M Electrical in reply to Freud21911, 08-16-2007 06:14:47  
I agree with the glennsters good adive and would add my FIRST response in those situations is to remove, clean n wire brush n reattach each n every battery n starter n starter switch n ground cable n connection. That smoking arcing connection is a prime suspect and may require a new cable cuz its burned n carboned between the cable and the terminal end. I REALLY REALLY SUSPECT THAT CABLE IS BADDDDD DD

Once that cable or end is repaired and alllll lll connectiions n cables n grounds are good and the battery is good n charged, turn on the lights then try n start her. If the lights hardly dim and she dont crank I suspect the starter switch may be bad although it could still be a bad starter. If the lights dim way down badly but she dont crank or cranks slow and/or the starter gets hot or smokes, then I suspect the switch is okay but its a starter problem.

You can use jumper cables to by pass the starter switch (jump around it) or jump direct from battery to the starter motor like Glenster talked about but use caution n dont let the cable go to ground and thats a high amperage connection ya know so watch out for arcs n sparks.

John T

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Freud21911

08-16-2007 08:00:37




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 Re: Super M Electrical in reply to John T, 08-16-2007 07:44:02  
Thanks to both of you. I"ll take the advice and let you know. The cables are brand new and I have already cleaned and put all connections back together. Now that I have your advice I"ll be looking at the starter. Thanks again to both of you.



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Bob

08-16-2007 16:39:50




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 Stud in reply to Freud21911, 08-16-2007 08:00:37  
I'll bet the stud at the starter turned a bit when you changed the cable, causing a "short".



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Freud21911

08-16-2007 16:45:32




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 Re: Stud in reply to Bob, 08-16-2007 16:39:50  
That's exactly what happened. How do I fix it?



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Bob M

08-17-2007 04:48:13




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 Re: Stud in reply to Freud21911, 08-16-2007 16:45:32  
If it's got the OEM-style starter switch (saddle mount, perched atop the starter) and the stud on the switch has turned, the fix is to replace the switch. Figure $10 - $15 for the switch and 5 minutes to swap it out.

However if the starter switch is remotely located and connected to the starter with a battery cable, and the cable terminal has turned in the starter, the starter will need to go to a starter shop for repair.

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glennster

08-16-2007 07:04:29




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 Re: Super M Electrical in reply to Freud21911, 08-16-2007 06:14:47  
sounds like its a 6v positive ground system, normal for that tractor. could be a bad starter, or bad starter switch. try taking a set of jumper cables, use one side to jump from the negative post of the battery and then touch it to the starter post where the battery cable hooks up. if the starter is good the tractor should turn over. if it turns over, try cleaning up all the electrical connections from the battery to the starter.if that doesnt help, replace the starter switch. if the starter doesnt turn over when you jump it, remove the starter, set it on the ground, hook up the jumper cables, positive from the battery to the starter case, and then jump the negative to the starter post. if it doesnt sping freely, the starter needs work.

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