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12 volt conversion trouble 9n

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Mark W NY

01-01-2005 15:27:05

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I changed our 1941 9n to 12 volt. when i finished the converion it started right up ran for a few minutes and then quit. I found the points were burnt, so i changed them,no luck, then changed the condenser and coil. still no luck. i am not getting any spark. I do have power to the coil. I did notice that the spring end of the coil looks like it is burnt. When I changed it to 12 volt I used the same ceramic resister and diode, that i used when we changed 2 of our allis"es to 12 volt, i did not have any problem with them. it is a WELLS F795 ceramic resister. could this be my problem. Thanks for your help. I know the snow will be coming and this is our plowing tractor.

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Mark W ny

01-01-2005 16:18:42

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Re: 12 volt conversion trouble 9n in reply to Mark W NY, 01-01-2005 15:27:05

Dell, The wells ceramic resister is to drop the voltage to 6v. we have used it in 2 of our allis. I currantly have the original resister out of the circuit.All of the wiring diagrams show using a RU 100 votage reducer. I may have missed something in reading the diagram. I will have to try putting it back in the circuit.or find a 12volt coil and use your trick. Thanks

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Bob

01-01-2005 16:47:23

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Re: 12 volt conversion trouble 9n in reply to Mark W ny, 01-01-2005 16:18:42

This Ford 6 Volt coil is designed to run at less Volts than the Allis 6 Volt coil.

The 6 Volt Ford coil needs the original ballast resistor PLUS the "6-to-12 Volt converting resistor" to live on a 12 Volt system.

Furthermore, a resistor does not just automatically drop 12 Volts to 6 Volts.

The voltage dropped by the resistor you used is dependant upon the current flowing through the resistor. There may be a enough difference in the current draw between the Allis and Ford systems to affect the voltage dropped across your resistor, and that will result in a different voltage being sent to the coil.

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Dell (WA)

01-01-2005 15:53:36

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Re: 12 volt conversion trouble 9n in reply to Mark W NY, 01-01-2005 15:27:05

Mark..... ....donnno nuttin about Allis but the conversion to 12v for the squarecan frontmount 9N is full of danger for the electrically challenged. Your description has all the indications of OVER-VOLTS, burned points, burned coil springy thingy

Iff'n the Wells resisitor is a 12 to 6 volt converting resistor, You ALSO NEED the "infamous ballest reistor" connected in series like flashlight batteries. Without the ballast resistor you are OVER-VOLTing the squarecan 6v frontmount ignition coil and may have permanently damaged your OEM 6v coil.

The "infamous ballast resistor is mounted on a "T" bracket on the backside of your dashpanel underneath your ammeter..... ....Dell

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Bob

01-01-2005 15:32:29

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Re: 12 volt conversion trouble 9n in reply to Mark W NY, 01-01-2005 15:27:05

At this point, it might be best to replace the coil with a 12 Volt unit and eliminate ALL resistors you now have, and install "Dell's trick current limiting resistor" to limit current to the coil and points.

See link:

Resistor

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MARK W NY

01-01-2005 15:59:06

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Re: 12 volt conversion trouble 9n in reply to Bob, 01-01-2005 15:32:29

I had called the local ford tractor dealership and asked if the had a 12v. coil for a 9n and they told me no.Is Dell"s set up put in line to the coil? I have been looking in the archives and reading a lot of posts from Dell. I will have to look on this site for a 12 v.coil.

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