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12 volt vonversion

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A in Ala

04-29-2001 19:38:03

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I used Brian's diagram and it cranks
and runs fine, also charges but does not shut off when switch is turned off. Help !!!!!

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Dell (WA)

04-29-2001 21:20:18

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Re: 12 volt vonversion in reply to A in Ala, 04-29-2001 19:38:03

Big A..... ..I know why you can't turn your 12 volt converted tractor off.

Your alternator is feeding back battery volts from inside the alternator out thru pin #1 which is the excite wire from the ignition switch. The same ignition switch contact also wires to your ignition coil. Which is why your engine keeps running.

I am aware of 4 different "decoupling" schemes to prevent this problem. Wiring in an "idiot light" and figguring where to mount it. Wiring in a "diode" and you have a 50% chanch of being wrong the first time. Wiring in a 10 ohm, 20 watt power resistor, and figguring out where to mount that hot sucker. And just recently, someone told of using a turnsignal flasher to stop the engine from running, apparently quite popular with Model A fans.

Since I can't remember how Brian's wired his alternator...your choice, idiot light is how Chevy does it..... ..Dell

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A in Ala

04-30-2001 07:50:24

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Re: Re: 12 volt vonversion in reply to Dell (WA), 04-29-2001 21:20:18

Thanks Dell:
I have the "idiot" light wired in like Brian
has it drawn but it still runs. Guess I will try one of the ways you discribe. Probaly the diode. thanks again

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Claus

04-30-2001 09:51:43

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Re: Re: Re: 12 volt vonversion in reply to A in Ala, 04-30-2001 07:50:24

Well, the problem with bulbs is that you have to be careful of what kind you use. The filament has to increase in resistance to lower the voltage to the coil sufficiently to cause the igntion to stop functioning. This has to be a low current bulb. on the other hand it must pass sufficient current to excite the field.
Happy moting. Claus

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Claus

04-30-2001 04:47:08

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Re: Re: 12 volt vonversion in reply to Dell (WA), 04-29-2001 21:20:18

Actually, General Motors recommends a 10 ohm, 7 watt resistor. I recommend to replace that with a 10 ohm 10 watt resistor, because it is available at Radio Shack and the extra wattage doe not hurt either. (It will run cooler) The RS part number is available on my site under alternator diagram. You are correct in saying that the diode can be put in either way, the correct way and the incorrect way, and if one were to haphazardly install it, Murphy said that it will be wrong. If one puts the anode of the diode towards the ignition switch, you will get it correct 100% of the time. I will not comment on the flasher.
Happy Motoring
Claus

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