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John Deere 80 Pupmotor 12 volt conversion

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Daren Donszelma

06-25-2002 14:57:44

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Hi, I have a friend who wants to change the Pupmotor from 6 volt to a 12 volt system. Does anyone know if it is possible to get 12 volt coils for the John Deere 80 Pupmotor.

Thanks

Daren Donszlemann

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Clooney

06-25-2002 15:30:07

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Re: John Deere 80 Pupmotor 12 volt conversion in reply to Daren Donszelmann, 06-25-2002 14:57:44

Daren, as Frank said I don't know why he wants to convert, but if there is a valid reason, a resistor or regulator would probably work [IF] the resistor or regulator doesn't allow voltage spikes [those pup 6 volt coils don't like high voltage, even for a short time].
~If new coils are in order due to failed 6 volters, or other reason, a coil pack from a mid 80's G.M product that used a lost spark system will work just great.
~I have done a couple & seen quite a few on other tractors & that system will function good, the only problem is the coils won't fit in the distributor & must be mounted outside the dist. box so it won't look original. I can usually get the coils up high on the pony so the only give away is the plug wires don't run from distributor box.

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F-I-T

06-25-2002 15:11:22

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Re: John Deere 80 Pupmotor 12 volt conversion in reply to Daren Donszelmann, 06-25-2002 14:57:44

Daren:

I've only ever seen them in the 6 volt variety, though I guess you could use something like an electronic voltage regulator (LM309K for example?) to drop a reduced but consistent 5 volts say to the 6 volt coils. Or find a wire-wound resistor that would drop the voltage down from 12 to about 5.

You won't get a hotter spark, so that might defeat the purpose of converting it to 12v.(unless you're after faster cranking speed). Unless he needs to get 12 volts to run some other accessories, he might be as well off with a really good 6 volt battery, and just spiff up the rest of the system if the pony runs well now. I find that 6 volts really likes good solid clean connections, and nice fat cables.

Good luck with it !

Frank-in-Tallahassee
70D // 855

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