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12 volt converson

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james braley

04-03-2007 13:24:43

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im am doing a 12 volt converion on my M. i need to know is thear anything else i need besides an alternater, coil,. batery.

thanks james

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David Goode

04-03-2007 16:58:18

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Re: 12 volt converson in reply to james braley, 04-03-2007 13:24:43

Your Going to need a Diode inbetween the alternator and coil.Make sure the White band is one the lead going to the Alt.

-David

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Bob M

04-03-2007 18:45:50

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Re: 12 volt converson in reply to David Goode, 04-03-2007 16:58:18

David - a diode is NOT required! As long as you use a properly rated warning lamp (noted in the diagram...) a diode is unnecessary.

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Jossette

04-03-2007 15:41:24

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Re: 12 volt converson in reply to james braley, 04-03-2007 13:24:43

should say 12 v on the coil it may have an R on it and would be for a internal resistor.

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Owen Aaland

04-03-2007 21:34:28

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Re: 12 volt converson in reply to Jossette, 04-03-2007 15:41:24

That wiring will work, however, if the bulb burns out, the alternator will not get the voltage necessary to start charging. This type of system usually has a small resistor built into the lamp holder to allow the necessary voltage even if the bulb is bad.

If the system is going to have heavy electrical loading, you can run the wire from the #2 terminal on the alternator to the battery cable at the starter instead of the output on the alternator. That will allow the alternator to put out a little bit higher voltage to compensate for any voltage loss between the alternator and battery cable.

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john d

04-03-2007 13:33:03

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Re: 12 volt converson in reply to james braley, 04-03-2007 13:24:43

Check Bob Melville's wiring diagrams in the link below. His generous work has saved many of us from eletrical problems.

You'll also need a ballast resistor unless your coil is a true "12 volt" coil. Depending on your alternator choice, you may need an indicator light. If the tractor has lights, you'll need 12 volt bulbs.

Having done a couple of these, I recommend ripping out and throwing away all the wiring except the battery cables.

Bob Mellville's Diagrams

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james braley

04-03-2007 13:45:18

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Re: 12 volt converson in reply to john d, 04-03-2007 13:33:03

how do you know if a coil is a true 12 volt.

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John T

04-03-2007 14:32:37

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Re: 12 volt converson in reply to james braley, 04-03-2007 13:45:18

If you buy a new 12 volt coil, no need for any external ballast. A 12 volt coil will have somewhere aorund 2.5 to 3.5 ohms of primary winding resistance as measured between its lil + and - terminals. It may be labeled "12 Volts" or "12 Volts NOT for use with ballast resistor" NOTE if its labeled " 12 volts for use with ballast resistor" then you need one cuz its in reality a 6 volt coil.

If you change from Pos to Neg ground the coil should be wired - to distributor ya know and the ammeter leads need swapped or it will read bass ackwards.

John T

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