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Ford 9N, 2N & 8N Discussion Forum
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Grounded Distributor

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Oh_dad

05-09-2005 14:49:18




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I don't understand the circuitry. I'm getting no spark. I tried to set up a test station off the tractor. When I check the coil to ground, I get a connection every time the points close. I believe that there should be no connection to ground with the points either open or closed? I'll start taking the contacts and distributor further apart. Seems like there is a lot more metal then insulation in this darn thing!

Thanks!

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TennesseeMan

05-09-2005 16:39:00




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 Re: Grounded Distributor in reply to Oh_dad, 05-09-2005 14:49:18  
I'm not sure if this is your same problem. Recently I replaced the points on my 8N and I had them installed and gapped, but I was not getting any spark what so ever. I ran a meter across ever thing and I finally found the problem. The screw that hold the brass strip in place as well as the points was grounded out. I backed the screwed out about 1/4 of a turn and I finally got spark to the points. I tightened the screw back up and again grounded out the points. So that was my fix to a very frustrating problem. Good Luck.

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Bob

05-09-2005 14:55:28




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 Re: Grounded Distributor in reply to Oh_dad, 05-09-2005 14:49:18  
When the points are closed, they short the distributor end of the coil primary to ground. If you are checking from the coil primary terminal (where the wire from the switch or ballast resistor connects) to ground, there is such a low resistance in the coil primary winding that the terminal will seem like it's grounded, too.

With the points open, resistance from either coil primary terminal or the insulated breaker point should be INFINITE to ground.

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oh_dad

05-09-2005 16:16:40




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 Re: Grounded Distributor in reply to Bob, 05-09-2005 14:55:28  
This one is even dumber. I"m checking for continuity from the top of the distributor to each spot that you jam the plug wires into. I get continuity at only two of the 4 spots with my multi-meter. You can feel friction at these two spots but not at the two spots where I get no continuity. I believe that I should get a new rotor and cap, even though the guy I bought the tractor from says he gave it a good tune up right before I picked it up.

As an aside, the thing started up OK the day I checked it out and committed to buy it. He called to say that it had a "hitch" to it, so he tuned it up. I haven"t been able to get it running since. He sure didn"t do me any favors! I got a lot of info from this forum and hope to have it running some day. No spark!

Thanks

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Dell (WA)

05-09-2005 16:35:29




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 Re: Grounded Distributor in reply to oh_dad, 05-09-2005 16:16:40  
Oh-Dad..... ....on a GOOD distributor, you should NOT GETT continuity between the distributor cap nipples and the coil. Supposta be about 0.005 air gap. ...but... yer sparkies will jump the airgap just fine. Iff'n yer rotor is touching the distributor contacts, then yer rotor shaft/bearings are BAD..... ....Dell, yer self-appointed sparkie-meister



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Bob

05-09-2005 16:32:43




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 Re: Grounded Distributor in reply to oh_dad, 05-09-2005 16:16:40  
The "spots where you jam the plug wires into" are the high tension terminals. The connection at the top of the cap feeds the little carbon button in the center of the cap that the rotor touches, and the outer edge of the rotor should not quite contact the outer terminals, but rather passes clear of them by a small fraction of an inch, and the high voltage spark jumps the gap to the respective high-tension terminal.

So, actually, the 2 locations where you are reading continuity are abnormal, and the 2 terminal locations where you're NOT reading comtinuity are behaving more normally!

If your rotor is actually contacting 2 of the terminals, you may have worn distributor bushings, or a bent shaft. Also, it seems some of the off-shore manufactured caps and rotors these days are not always accurately made.

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