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Tractor Talk Discussion Forum

John deere m ignition/light switch

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kdg

04-16-2008 20:22:53




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Hi, has anyone had luck finding a new 6v switch for this tractor, everyone seems to sell the 12v kind. I do not want to convert to 12 volt but has anyone been able to use any of the new ones sucessfully with the old 6 volt system?
Thanks!




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James Howell

04-17-2008 10:18:37




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 Re: John deere m ignition/light switch in reply to kdg, 04-16-2008 20:22:53  
I replaced the ignition switch, amp gauge, and all wiring on my favorite wife's 51M about a month ago.

Ordered the ignition switch from JD; paid "deere-ly" $70+ for it.

No problems with the ignition or lights after installation.

Cut-out relay is obsolete; be careful with it.

Hope this helps.



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John T

04-17-2008 05:08:07




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 Re: John deere m ignition/light switch in reply to kdg, 04-16-2008 20:22:53  
On the three brush generators that used a cutout relay versus a Voltge Regulator, the light switch was dual purpose cuz in addition to lights it also allowed for Low or High Charge settings anddddd dddd it has a certain ohms value resistor to limit field current when in LOW charge position (it wires to the gennys FLD post). One possible problem is the resistor may be of a different value depending on if its a 6 or 12 volt generator sooooo oooo Im not even sure they made an M switch for 12 volts but if so insure the switches resistor is the right value. If not she can still work n charge but the Low charge rate may not be what its supposed to be i.e. if the resistor is wrong value the gennys Fields may draw too little or too much current. Of course, the lights dont matter either switch should still work fine far as lights are concerned, its just that Low/High charge resistor value may be different (if they even make one for 12 volts at all???)..... . In high charge the gennys field is dead ground NO resistor used so it wouldnt make any difference in that case and a lot of time people used the High charge switch setting anyway so theres no problem if a 6 or 12 volt in that scenario. If shes converetd to a full fledged Voltage Regulator then the light switch no longer wires to gennys FLD post and the light switch will still work regardless if 6 or 12.....

John T

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IaGary

04-17-2008 04:04:58




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 Re: John deere m ignition/light switch in reply to kdg, 04-16-2008 20:22:53  
The switch doesn't care what the voltage is.

As long as it will handle the amperage you need it will work.

You can run 6 volts thru a 12 volt switch and it remains a 6 volt system.

Gary



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