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8-n burned up coils

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Jim

08-17-1999 11:46:07




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I purchased a 8-n which runs great for about 2 hours then coil goes out. I have put in 4 new coils, rebuild distributor,changed out 8 volt battery to 6 volt. Coil still quits after 2 hours. Can anyone give me something else to look at? Help!!!




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phil (NJ)

08-17-1999 21:07:19




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 Re: 8-n burned up coils in reply to Jim, 08-17-1999 11:46:07  
Jim, You have very good advise, make sure the DC components and voltages are Correct, but do not under estimate the effects of bad Connections Or "Pure" resistance because under inductive loading they can be destructive.

JMHO



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EricG.NH

08-17-1999 13:38:51




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 Re: 8-n burned up coils in reply to Jim, 08-17-1999 11:46:07  
You need to measure the voltage at the top of the coil, with the ignition on and with the points closed and open. Both measurements will tell you if you have a resistor, if its connected properly and if it works. Next you need to measure the generator output when its running. It could be outputing a higher than normal voltage in order to properly charge an 8 volt battery. Who knows what was done before.
Eric

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David (La)

08-17-1999 12:46:14




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 Re: 8-n burned up coils in reply to Jim, 08-17-1999 11:46:07  
Do you have a ballast resistor? This is a large ceramic type with coil of wire thingy which connects between the ignition switch or terminal wire and the coil. The purpose is to step down the voltage to the coil to about 4 volts instead of 6 volts. If this resistor is not in place then you will be burning up coils/and or points.



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Jim

08-17-1999 13:44:03




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 Re: Re: 8-n burned up coils in reply to David (La), 08-17-1999 12:46:14  
I probaly don't because I've got about 6.4 volts on my coil. Will check when I get back home to the tractor.Do you happen to know what value resistor the ballast resister is? Thanks for info sounds like this could be my problem.



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TimK

08-17-1999 14:17:01




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 Re: Re: Re: Re: 8-n burned up coils in reply to David (La), 08-17-1999 13:49:06  
Postscript: A new 6v resistor will smoke slightly when it's first hooked up, so don't get rattled if that happens.



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David (La)

08-17-1999 12:02:40




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 Re: 8-n burned up coils in reply to Jim, 08-17-1999 11:46:07  
Is this a front mount or side mount distributor?
What does the motor do when it stops, sputter gasp or just up and quit? Did you check for spark after it quit? If no spark, did you jump the ignition switch to rule out the switch? Give us some more info and these guys can head you in the right direction!!



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Jim

08-17-1999 12:26:11




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 Re: Re: 8-n burned up coils in reply to David (La), 08-17-1999 12:02:40  
This is a front mount.when it stops it quits suddenly, I have battery on top of the coil but no spark when I change coils it again starts right up and runs great.



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Fred

08-17-1999 13:40:15




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 Re: Re: Re: 8-n burned up coils in reply to Jim, 08-17-1999 12:26:11  
Check the voltage at the coil. Should be about 31/2 volts. If more the resistor is bad. Where are you buying coils? I got one from the local feed store, was junk. The one from the Ford dealer was the same price and much better. Might check to be sure the high voltage side is bent to where it touches dist. cap. Does the gasket between coil and dist. fit right? Coil should set tight on top. When coil quits is it hot to touch?

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Jim

08-17-1999 14:18:45




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 Re: Re: Re: Re: 8-n burned up coils in reply to Fred, 08-17-1999 13:40:15  
coil is very hot when it quits,bought from local ford dealer.voltage is 6.4 volts.



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Dell (WA)

08-17-1999 14:54:47




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 Re: Re: Re: Re: Re: 8-n burned up coils in reply to Jim, 08-17-1999 14:18:45  
6.4 volts at the coil with the points closed means your ballast resistor is not in the circut from the ignition switch terminal to the coil terminal.

Without the "ballast resistor" to control the current (amps) to the coil, I will guarentee you that you will burn out your coil in about 2 hrs. The way to determin if your ballast resistor is in the circuit, is to measure the voltage at the coil with the points "closed" and it should be about 3.5 to 4.0 volts. With the points open, you will read battery voltage of about 6.4 volts.

How to determine when the points are closed and how to make the points close when you want? Just put the tractor in gear and push on those great big ol' tires and roll your tractor a little bit watching the voltmeter for a sudden change, one way or other. and you got it!

Hope this helps..... ...Dell

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