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Ford 9N, 2N & 8N Discussion Forum
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About ready to call in th troops on electrical problem

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P Martell

07-12-2007 14:33:13




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I posted here a bit over a week ago. Was having problems getting the starter to turn over. I"m working with a 6 volt front mount distributor 8N engine in a 9N. Single post generator.

After cleaning all the terminals and connections, replacing the battery cables and ignition switch, I was able to get the starter to spin the engine. But no spark. I have replaced the spark plugs,coil, points and condenser and the generator cut out relay. Gapped points at .015. Made sure condenser lead was not shorting out on the housing when I put the lead through the housing. Turned over and checked for spark by placing spark plug on top of engine block. None.

I have 6 volts reading to the top terminal of the of the coil. Other than that, I do not know where or what readings to take to trace the circuit. If you can be of assistance, please be very specific as to where to place multimeter leads etc, as I really do not know where else to check or how. Nor what I am looking for.

Just know that I"d like to have it running again.

This tractor was working fine and just quit while sending hay up the elevator hooked up to the PTO.

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DanL-Colorado 9N252085

07-12-2007 19:01:27




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 Re: About ready to call in th troops on electrical problem in reply to P Martell, 07-12-2007 14:33:13  
Seems to me, if you have 6V to the the coil, you don't have any juice flowing through the circuit; if the circuit inside the distributor was shorted, current would be flowing and the ballast resistor would be reducing the voltage at your coil to 3V or so.

Therefore, you appear to have an open ignition primary circuit. Check that there "springy thingy". (Gawd, I love that technical talk...)

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HCooke

07-12-2007 17:18:39




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 Re: About ready to call in th troops on electrical problem in reply to P Martell, 07-12-2007 14:33:13  
The amp meter should show alternate discharge and no discharge when attempting to start. If it doesn't then the problem is in the distributor. Points not cloing, points shorted out etc.



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dan hill

07-14-2007 03:10:28




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 Re: About ready to call in th troops on electrical problem in reply to HCooke, 07-12-2007 17:18:39  
My dad showed me how to read the ammeter on a Model A Ford around 1950 .Points run hot and oxides form that can insulate the points.Watch the ammeter when the engine is cranking.If it doesnt move ,turn on the key or clean the points.



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Ross Pugh(NC)

07-12-2007 15:27:19




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 Re: About ready to call in th troops on electrical problem in reply to P Martell, 07-12-2007 14:33:13  
I am inclined to agree with BillM about the coil pigtail. You may need to stretch it slightly to be sure you are touching the concave screw on top of the distributor. Pull the coil off and put it back on without the gasket and try it for spark. If it works that is probably yer problem. If that is it, stretch the spring a little and put yer gasket back on. Good luck.



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old

07-12-2007 14:44:36




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 Re: About ready to call in th troops on electrical problem in reply to P Martell, 07-12-2007 14:33:13  
You may have a bad cap and or rotor or did you by chance forget to put the rotor back in?? I've seen more then one person forget to put the rotor back in and they will not spark with out it. Also all it takes is a hair line crack in the cap and you will loose spark or a crack in the rotor.



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BillM (OH)

07-12-2007 14:42:52




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 Re: About ready to call in th troops on electrical problem in reply to P Martell, 07-12-2007 14:33:13  
P: The "springy thingy" on the new coil may need to be (gently) stretched out a bit to make good contact with the distributor. Maybe points have slipped, condenser bad outta the box, etc. Also, before I put distributor back in, I check for grounds (points open - hot side to case - infinite) and continuity (points closed - other side to case - zero) with the multimeter set on ohms.
Don' give up - you will find it eventually.....

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