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AC D14 Hot Coil

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Tom Clayton

04-19-2003 07:00:25




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I'm getting my D14 going again and when I turn the power switch on the coil heats up too hot to touch. One of the mounting bolts has broken off in the block so it's only held by one bolt, could this possible lack of ground cause ti to heat up? Any other reasons?




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Jay Miller

04-19-2003 16:34:10




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 Re: AC D14 Hot Coil in reply to Tom Clayton, 04-19-2003 07:00:25  
The coil is NOT grounded. It's made up of a low voltage winding from the + post( battery) to the - post( going to the points) and a high voltage winding from the + post to the 'high tension' common of the distributer cap.
If the coil is hot, it's probably the one of windings shorting out to ground, causing high current flow, causing it to heat up.
They can't be fixed and only cost 10 or 20 bucks to replace. Be sure to get either a 12 volt coil, or a standard automotive unit AND a ballast resistor( usually 1.5 ohms).
Check where the coil touches the mounting band. If there's a small crack, the oil used to cool the coil will leak out, and make the coil faulty.
My D-14 coil went this way, swapped it out for a standard car coil and a Chysler ballast resistor.
Been running great ever since.

hth
Jay of Greensville,Ontario

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Tom Clayton

04-19-2003 19:33:38




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 Re: Re: AC D14 Hot Coil in reply to Jay Miller, 04-19-2003 16:34:10  
Jay
Thanks for your info:
"They can't be fixed and only cost 10 or 20 bucks to replace. Be sure to get either a 12 volt coil, or a standard automotive unit AND a ballast resistor( usually 1.5 ohms)."

I'll try a different coil. I'm not familiar with a ballast resistor, do I ask for that at an auto parts store and when I get it where does it go in the circuit? And, when you say either a 12 volt coil or a automotive unit and resistor, do you mean there is a coil that has a built in resistor?

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rudy

04-20-2003 07:58:18




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 Re: Re: Re: AC D14 Hot Coil in reply to Tom Clayton, 04-19-2003 19:33:38  
tom they should know what a ballast resistor is at the auto parts store but that doesnt mean they will best bet is to go to NAPA wire it in between the hot wire from the switch to the positive side of your coil it knocks the voltage from 12 to somewhere around 4 to 6 volts so u dont burn up your coil with a constant 12volts rudy in ks.



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