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Ford 9N, 2N & 8N Discussion Forum
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Dumb electrical questions

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packer

08-19-2006 17:30:23




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I have an 8N that just gives me fits. It is acting up again. It has no spark. I have put a electronic igntion kit in it and rewired the whole thing. I has run just fine for about an hour. The battery no longer dains so I hae that problem solved. I turn the key on and I checke the voltage to the top post of the coil ( front mount) and it is correct. I put the points and condenser back in to see if that had any effect - no change. I read alot about a bad igntion switch but isnt that something that works if it turns power on to the coil ( or am I oversimplifiing??). I am officially at a loss!!!

Here is a real dumb one - can continuity be checked on a rotor ( like from the centerpost to the metal tang? thought I had the old girl fixed . I am just about officially done with it.

Help?!

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johnv

08-19-2006 19:21:10




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 Re: Dumb electrical questions in reply to packer, 08-19-2006 17:30:23  
This may be way out there, but,check the bushing on the dist. it may be allowing the shaft of dist "slip" away from camshaft. Also check the dist shaft and rotor, make sure the rotor isn"t "hooking" on the inside of the cap, preventing the rotor from turning.



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packer

08-19-2006 19:25:34




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 Re: Dumb electrical questions in reply to johnv, 08-19-2006 19:21:10  
I just read your comment and got to thinking. Ever look at something and know something isnt right. I was looking at the rotor and knew something looked wrong - the metal "spring " that makes contact with the cap apparently got hooked,broke and is gone. I will get a new one in the AM.

thanks for your help. That is what I lie about this site - getting others perspective!



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don t.-9n180179

08-20-2006 03:46:35




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 Yep, got me too in reply to packer, 08-19-2006 19:25:34  
Bout a month ago, same thing happened to me. Took about 6 hrs to find it, not including archive search time. Swapped an old 1 I had layin around. Aint had a problem since.
Personally, was a whole lot easier than working on these new fangled cars now days (big grin).
Have fun.....don t. ....



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Robb Pearson

08-19-2006 17:48:37




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 Re: Dumb electrical questions in reply to packer, 08-19-2006 17:30:23  
I do not know what you have tried.
But for me I would run a clip lead type wire from the battt + to the coil.

If there is a resistor in the circuit I have seen these get rusted under the resistance contact screw/s. The continuity between the rotor button and the carbon button should not be any proble unless the rotor button has a very fine internal crack where the spark could run to ground. However once that occured, it generally would never run until it was replaced. Remember that the spark jumps out to the brass connection in the cap that leads to the correct wire to the spark plug. Therefore the rotor button really should touch the incoming brass connection from the Ign Coil. I have seen the little carbons jambed up in their hole inside the cap and the dam engine still runs - But there should be contact at that point to the rotor button
Robb Syracuse NY area.

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packer

08-19-2006 17:59:30




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 Re: Dumb electrical questions in reply to Robb Pearson, 08-19-2006 17:48:37  
It seems like I have tried everything(ha)!! The ballast resister is new (voltage to the top of the coil is about 7.8). I thought maybe I had done something wrong with the electronic iginition but putting the points / condenser back in had the same bad result.

This is frustrating!



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packer

08-19-2006 17:42:35




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 Re: Dumb electrical questions further info in reply to packer, 08-19-2006 17:30:23  
The votage to the top of the coil is 7.8 volts. It is a 12 volt conversion



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BillM (OH)

08-19-2006 18:54:36




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 Re: Dumb electrical questions further info in reply to packer, 08-19-2006 17:42:35  
If you have a 6 volt coil, you need a dropping resistor and the ballast resistor so volts on coil would be about 3.8 with points closed and battery volts with points open. If you have a 12 volt coil, no ballast resistor is called for - just Dell's secret parallel Radio Shack (1 ohm resistors, if I remember right) wired in parallel. Coil top would then read 12 volts with points closed and battery volts with points open. If you're reading 7.8 volts with points open, you have a short somewhere in the distributor. Note that 7.8 volts on a 6 volt coil will probably cook it toot de suite. I would also get a new ignition switch. HTH

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