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John Deere Tractors Discussion Forum
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140 Update. John T, FIT, Bob

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Ron B in CO

06-15-2007 16:55:44




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Thanks for your help. I think I found the problem. The coil had continuity from both posts to ground with the coil isolated. Never been inside of a coil, but guess the primary winding could short to the case. Could also be the cause of no power and hard starting. Couldn't repeat the continuity results once the coil was removed from the clamp mount. What do you guys think?




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CENTAUR

06-15-2007 18:03:20




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 Re: 140 Update. John T, FIT, Bob in reply to Ron B in CO, 06-15-2007 16:55:44  
I think the clamp distorted the case! CENTAUR



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John T

06-15-2007 17:59:25




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 Re: 140 Update. John T, FIT, Bob in reply to Ron B in CO, 06-15-2007 16:55:44  
If the coil wires were completely removed from the tractor, there ought to be around 3 ohms continuity between the lil + and - terminals (Primary) and several thousand ohms from the high voltage tower (Secondary). As long as the coils - was still wired to the distributor and its internal points and they were closed, there would be near a dead short from that coil terminal to ground and around 3 ohms from the other terminal to ground (in series with primary winding). There shoudnt be any continuity from any coil terminal to its steel case or its got an internal short UNLESS its a coil that uses case ground of some sort????? ?

If theres still low resistance to ground from the coils - terminal with the points held open, then suspect EITHER a bad/shorted condensor or a short on the points or the wiring like Frank originally mentioned. Remove the condensor wire to see if a shorted condensor is the problem if the wires on the points arent shorted.

Another possible short is where the lil stud passes thru the side of the distributor. The plastic can get broke and that terminal get shorted out BETTER TAKE A LOOK AT THAT

If you turn on the ignition and place a DC test lamp on the coils terminal that wires to the distributor, the light should glow ON when points are open (UNLESS theres a short in points or condensor or pass thru terminal or wiring) but go OFF when they are closed (unless the points are bad or not closing or not wired correct or not grounded)

Get it ????? ?

John T

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John T PS

06-16-2007 04:07:00




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 Re: 140 Update. John T, FIT, Bob in reply to John T, 06-15-2007 17:59:25  
Oops, Silly me, I keep forgettin its a lawn tractor and dont have a distributor. Sooooo oooo disregard the above concerning the distributors pass through stud/terminal HOWEVER the points n condensor n all that still holds true and the test lamp still should work as described, its just that the coils low - terminal wires direct to points n condensor WITHOUT having to pass through any regular distributor. i.e. check the wire from coil to points and the points n condensor wiring. Stilllll l the coil is bad if any of its terminals have a short or continuity to its case unless its a different coil then Im used to.

John T

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