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Farmall & IHC Tractors Discussion Forum
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No voltage at coil

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Terry

08-01-2004 17:14:40




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My IH Cub just quit as if the key switch was turned off. With the key on I have no voltage at the coil, but if I remove the wire from the + side of the coil I have voltage.
Any ideas out there
thanks




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Dieselrider

08-02-2004 04:09:06




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
Terry, I had the same thing awhile back. If it quit all the sudden, it is probably the coil that's bad. Let us know how you make out.



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terry

08-06-2004 16:01:39




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 Re: No voltage at coil in reply to Dieselrider, 08-02-2004 04:09:06  
able to get back on the tractor. I found the ammeter shorted out. bypassed the meter and it starts and purrs like a kitten. Thanks to all for the help.



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Ol Chief

08-01-2004 20:50:47




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
I had this problem on IH 460.I found the coil feed wire frayed down to only one intact wire strand.With wire off coil and no load had 12 volts.With load connected showed zero at coil.



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riverbend

08-01-2004 19:51:52




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
If it is not a bare wire, check that your condensor is not shorted.



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Stan(PA)

08-01-2004 19:33:46




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
The wire going to the points is pinched somewhere, and grounding before the points.



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Allan in NE

08-01-2004 17:55:00




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
Terry,

If your points are closed, you won't 'see' any voltage at the coil. Make sure the points are open before testing for voltage at the primary.

Allan



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lee

08-01-2004 17:54:28




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
Unclear, what you wrote. Be more specific. 6 Volt system? This Cub is positive or negative ground? Where exactly are you measuring this voltage? From + on coil to ground? From - on coil to ground. What side of coil goes to the switch? Assuming a 6 volt system, whatever the polarity, you should have 6 volts (it may read + or - depending on polarity) to ground at the coil terminal that leads to the ignition switch with the key on and the breaker points open. You should have 6 volts at that same spot with breaker points closed. You should see 6 volts across the 2 coil terminals with breaker points closed and zero volts across the coil terminals with breaker points open. There are many things to look for. The feed from bat to switch may be bad, the switch may be bad (jumper across it) the wire from switch to coil may be bad, the wire from coil to points may be bad (look for a short to ground where it passes into the distributor), the points may be closed shut, the condensor may be shorted to ground, the coil may be shorted internally.

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Terry

08-01-2004 18:24:12




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 Re: No voltage at coil in reply to lee, 08-01-2004 17:54:28  
I have a 12 volt system negative ground. I measured from the + side of the coil to ground with the key switch on I have no volts regardless of the position of the points. If I remove the feed wire from the key switch to the + terminal on the coil I have 12 volts on the wire. If I touch the wire to the + terminal of the coil I lose the 12 volts.



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lee

08-01-2004 20:08:08




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 Re: No voltage at coil in reply to Terry, 08-01-2004 18:24:12  
6 or 12 volt coil? Resistor in the circuit anywhere? Fused anywhere between bat and switch and coil? Just a little mysterious to me not being there that you do not have 12 volts at coil + with the points open. I am thinking there is something wrong in the feed circuit to the coil but it seems you would still have 12 volts with points open. Suggests maybe also a shorted coil or capacitor. You will have 12 volts at coil positive all the time points open or closed when all this is resolved. Leave it at that for now. Back to what you wrote above. It sounds like you have 12 volts open circuit voltage (+ wire disconnected from coil) measuring from + coil wire to ground but maybe a poor connection or bad switch so when you measure open circuit you get 12 volts but when you connect and put a current (coil) load on it it fails to pass the current. If you hot wire direct from bat + to coil + everything else assumed good it should start. I would just touch this hot wire to coil momentarily to test for excessive current (excessive sparks) draw suggesting a shorted coil or condensor. Test it points open and closed. Don't touch the metal terminals or wires or coil, you may get a slight shock.
Stay clear of the coil secondary or disconnect at the coil. If there is a resistor in the coil feed circuit somewhere don't run too long with a direct hot wire. Do you have a 6 volt coil? Jump around the switch terminals to test the switch.
If you jump around the switch and it start it's the switch. Check the wiring from bat to switch to coil if switch jumper does not help. If a resistor is in series with coil (between switch and coil) somewhere it may be defective. If a fuse is in there somewhere it may be defective or poor connection.

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john *.?-!.* cub owner

08-01-2004 19:09:40




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 Re: No voltage at coil in reply to Terry, 08-01-2004 18:24:12  
Terry, Since it is a 12 volt system I assume the + side of the coil goes back to the keyswitch. I also am assuming it is a cub and not a cub cadet. Either you have a coil that is shorted , or a bad connection or faulty key switch. A shorted coil is unusual and should be causing the wiring to get hot. If you have a dropping resister (usually a long ceramic block with a terminal aon each end) to cut the battery voltage from 12 volts to 6 volts for the coil there is a good possibility it is faulty or has a coroded connection. Connect your coil and turn the switch on, then start working back toward the switch with your meter/test light.

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Rich

08-01-2004 17:30:30




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 Re: No voltage at coil in reply to Terry, 08-01-2004 17:14:40  
Sounds like you need a new set of dist.points and a condensor.



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