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Re: NAA-No power to Distributor

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RKS

05-04-1999 16:01:07




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I'll have to spend a little time thinking about it, but if what you report is absolutely true, and you haven't caused it yourself when you reconnected the points, condenser, etc. - - then you are describing what can only be a grounded distributor. My first guess would be a poor connection/poor insulation condition where the lead goes into the distributor. I think there is a little rubber "boot" there. That lead should not make contact with the outside of the distributor, which would constantly charge the primary winding of the coil, but should only contact the points and condenser. If it touches the outside chassis of the dist, then it doesn't need the points to find ground through the mounting plate, since it is always grounded. Look for a naked wire at the "lead in" to the dist. I would completely remove it and run another wire all the way from the coil through the boot and into the dist if I were you. Try this: I'll bet you that if you reconnnect it, and remove the coil wire from the dist and put it close to the block, when you disconnect the lead, bet the coil fires. If so, you know the trouble is in the dist. Good luck - RKS

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Andy Deltour

05-05-1999 08:55:08




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 Re: Re: NAA-No power to Distributor in reply to RKS, 05-04-1999 16:01:07  
Thanks for the info, RKS. I'll try your ideas and see if they work. Do you have a part Number for the "Troubleshooting Guide" you referred to? I would like to get one if possible.



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RKS

05-05-1999 14:53:33




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 Re: Re: Re: NAA-No power to Distributor in reply to Andy Deltour, 05-05-1999 08:55:08  
one little correction: the lead in from the coil to the dist connects to the "hot side" point contact, not the dead side. The dead side is made hot when the points close and the dead side is common with the mounting plate. In fact, it is grounded to the mounting plate. The hot side point is always hot with "pos" voltage, but current only flows through it (and therefore through the primary winding of the coil) when the points close. RKS

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Andy Deltour

05-05-1999 15:30:37




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 Re: Re: Re: Re: NAA-No power to Distributor in reply to RKS, 05-05-1999 14:53:33  
RKS. I tried your idea about running a new wire over to check it out and it worked. Turned out to be the piece of copper or brass from the dist. connector to the points was broke. Still had continuity but could get no power. Fixed that piece and the Tractor fired right up. Thanks for the help.



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RKS

05-05-1999 17:57:44




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 Re: Re: Re: Re: Re: NAA-No power to Distributor in reply to Andy Deltour, 05-05-1999 15:30:37  
good - these old simple ignition systems can be fun to work on. It's like hiding a watermelon under one of about 5 boxes, and then getting someone to find the watermelon. Well - there's only one melon, and there's only 5 boxes, - just a matter of time. I once thought there wasn't an ignition problem I couldn't find - then Detroit decided to put me out of business. RKS



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RKS

05-05-1999 09:24:29




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 Re: Re: Re: NAA-No power to Distributor in reply to Andy Deltour, 05-05-1999 08:55:08  
just click over to the left on "tractor manuals" and order one. The shop manual is going to be a reprint, since the original is not available. It will probably be a Ford authorized reprint. RKS



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RKS

05-05-1999 02:55:33




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 Re: Re: NAA-No power to Distributor in reply to RKS, 05-04-1999 16:01:07  
yea, the troubleshooting guide points toward a ground somewhere in the primary circuit and the lead from the coil to the dist. Since you have voltage with the lead disconnected, there is probably a short somewhere between the coil and the dead side of the points (where the condenser joins with the points - and that union is insulated from the mounting plate which can only make a grounded contact through the points when they are closed). You think you don't have power at the coil when the dist lead is connected. Actually, you have power but you would not see it with a test light since the short makes your testing positions "common" with ground and there is no potential across it. I think an ammeter from the battery pos side to the test point would show current flow with the lead connected to the dist. That's not important now however, since when you remove the lead you see voltage at the coil, you are already "proving" there is a short - if and only if "the points were not left in the closed position." So, remove the dist cap, put the tractor in high gear and gently rock it forward until you are positive the points are open - with the point contact on the dist cam lobe at the highest point. Now if with the dist wire connected you can't find voltage at the coil, then it is for sure grounded. If you can find voltage, it's normal (that's what the points do normally) and you must suspect the rotor, cap, coil high voltage wire, or plug wires. RKS

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RKS

05-05-1999 03:10:26




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 Re: Re: Re: NAA-No power to Distributor in reply to RKS, 05-05-1999 02:55:33  
the points work by closing and making a ground which charges the primary winding of the coil. At the instant they open, the ground is lost and the primary winding charge in the coil collapses, which cause inductance in the secondary winding. This gives the step up in voltage and since it is denied a ground through the points, it will seek a ground by jumping the gap at the only available ground, "the spark plug." So, if you can manually cause the coil to fire by putting the coil wire close to the block and then removing the lead from the dist to the coil (-) terminal, then you will prove the coil is ok, and the trouble is in the distributor. RKS

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