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Ford 9N, 2N & 8N Discussion Forum
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no spark

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popinjay

05-26-2005 10:04:21




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To all sparky-meisters- this forum has been a great help, but the old tractor still won't run. New plug wires, condenser, rotor and cap, new points at .o15, and timing checked with straight edge. Ordered new coil, still no spark. I get 6.4 volts thru the resistor and 5.5 thru the coil primary. Couldn't find anyone who could check the coil so I wired it to a grounded plug and made and broke the primary circuit- no spark, and it wouldn't light a timing light. Condenser was wired in and grounded. I wouldn't expect to have two bad coils, but I am out of ideas and I sure would welcome some new ones from you guys in the know! Thanks

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thudinga

05-27-2005 13:08:52




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 Re: no spark in reply to popinjay, 05-26-2005 10:04:21  
Is this a front mount Distributor? Is a 12 volt conversion? If it"s a front mount remove the distributor, and on the bench with the points open check to see if the Big brass screw at the top is shorted to the point plate, if so then the insulator is bad between the screw and the mount and needs replacing. Or you can buy a electronic ingition replacement and throw the points away :-).



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popinjay

05-27-2005 12:59:30




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 Re: no spark in reply to popinjay, 05-26-2005 10:04:21  
Thanks Guys- I finally found the problem. The 12 to 6 volt dropping resistor was apparently letting some volts thru but not enough amps to fire up the coil. Orielly sold me one for a 78 Dodge and it fired right up and mowed five acres before the lift let down. Now I am looking for help on hydraulics!



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RoNofohio

05-26-2005 12:27:55




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 Re: no spark in reply to popinjay, 05-26-2005 10:04:21  
Had the same problem. replaced (points, plugs, cap,etc.) everything, but because the coil (12v) was only 3 yrs old and kinda expensive, I hoped it would be something else. Anyway, took the distributer and coil to an old timey mechanic. He took two test leads with alligator clips and a known good 12v battery. Ran one lead from the neg. post of the battery to the metal body of the dist. Then he ran another lead from the pos. post of the battery and touched it to the connector on top of the coil. If sparks fly, then turn the shaft a little bit to open the points. Then connect the pos. lead to that connector. Place the dist. on the floor and place a screwdriver in a fashion that it both contacts the metal body of the dist. and lays across one of the dis. cap nipples. Then spin the dist. shaft. When he first did this, nothing happened. Then he traded my coil for a new one and spin the shaft again. Fire jumped from the inside the nipple to the screwdriver. Needless to say, I bought the new coil and when installed, my 9n started right up on the first turn.

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Rob

05-26-2005 11:12:02




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 Re: no spark in reply to popinjay, 05-26-2005 10:04:21  
I don"t understand a couple things. You get 6.4volts "through" the resister and "through" the coil primary? Is that 6.4 volts at the top of the coil which is after the resister or at the battery side of the resister. Is that that 5.5 at the top of the coil or at the points? Anyway, 6.4v at the top of the coil, points open, and half that or less, points closed. My "44 was running with less than 2.5v.
I"m don"t understand what "broke the primary" means. Now they say you can remove the distributor cap, put the coil on there, turn the engine and watch the points for a spark. You can check voltages while you"re at it. If you don"t have volts at the points you"re getting somewhere with your troubleshooting. Maybe a cracked copper strip, maybe a crappy connection with corrosion or stripped screw, or maybe a grounded short.
Try some of that and good luck with it.

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Dan

05-26-2005 11:10:35




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 Re: no spark in reply to popinjay, 05-26-2005 10:04:21  
Make sure the copper strap is in place between the condenser screw and points and there is a spacer between the condenser screw and back plate. I made this mistake once...

Good luck,
Dan



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