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Tractor Talk Discussion Forum

12-volt conversion question

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Tim Shanks

07-17-2006 13:28:20




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I thought I had posted this last night, but can not find it for some reason...

I had read the article about 12-volt conversions (link below) on ytmag.com and thought it was great. I’m working on a John Deere B 1941. When I got the tractor, it did not have a generator on it. So, I took and went to AutoZone and got a Delco-Remsy Alterntor. A 10SI with 3-wire. I also got one of those little pigtails for the alternator. The pigtail has a White wire on the 1st pin, and a Red wire on the 2nd pin. I ran the Red wire over to the battery post on the alternator, then ran that wire to the amp meter then over to the battery.

My Question… I have a magneto on the tractor. The tractor has this ignition key that was used to enable the generator to charge the battery. I don’t want to put a warning light on the tractor like the article says. Is it possible to take and run the white wire directly over to the battery post? Or how about running it up to the key and then over to the amp meter? Like the drawing in the article shows? Or, can I just let the wire hang?

Thanks

Tim Shanks

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old

07-17-2006 14:03:00




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 Re: 12-volt conversion question in reply to Tim Shanks, 07-17-2006 13:28:20  
Well since you don't have the problem of shutting off the engine because of the mag you can run the #1 wire to the cold side of the switch when its off and be done with it. Key on alternator is excited as it needs to be key off no battery drain. Now if you had a distubutor then you would either need the lite or a diode but with a mag no problem

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Tim Shanks

07-17-2006 14:30:14




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 Re: 12-volt conversion question in reply to old, 07-17-2006 14:03:00  
If I understand this correctly, Run the #1 wire to the key switch, then from the key switch run a wire to the battery?

Thanks
Tim



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old

07-17-2006 14:45:47




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 Re: 12-volt conversion question in reply to Tim Shanks, 07-17-2006 14:30:14  
Yes sort of if say you have a 2 terminal key switch, one side would go to the battery, and the other side to the alternator which would bascilly just be an on/off for the alternator and if you forget to turn it off it will drain the battery.



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Tim Shanks

07-17-2006 14:47:22




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 Re: 12-volt conversion question in reply to old, 07-17-2006 14:45:47  
Thank YOU very much for your time... I will try to wire that tonight and let you know how it turned out!

Thanks



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Jon Hagen

07-17-2006 17:06:47




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 Re: 12-volt conversion question in reply to Tim Shanks, 07-17-2006 14:47:22  
Tim,If you get the right lawn mower ignition key switch,(most any that have electric start and mag ignition),it will have a couple terminals to connect the #1/white/alternator exciter wire to the battery when turned on and another terminal to ground your magneto when turned off. With this setup you are not nearly as likley to leave the alternator switch on and drain your battery,as the act of turning off the key to ground out the mag also turns off the alternator exciter circuit.

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