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Super A 12V resistors

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Jeb2N

04-21-2005 07:11:03

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Hey guys, I'm considering rewiring a friend's 12V conversion on his super A. He claims his alternator is not working and I figure that while i'm in there, I may as well do the wiring up right. Currently, he has two of the ceramic resistor blocks in the wiring. One is right after the alternator on the #2 terminal side (could be #1, i didn't get a good look), and the other is right before the coil. I agree that the one near the coil should be there, but i'm curious about the other one.

I've seen several diagrams that use a side panel light, but I don't want to drill a hole for a light and I have no soldering equipment to wire in a diode. I also feel that the diode may ruin the excitation properties of the feed wire. So basically, can anybody show me a complete diagram for the ignition system on a Super A with NO side marker lamp, and no diode, and how big the resistor should be between the Alt and the switch? Any recommendations on radio shack resistors? Assume this is a 6V coil.

Thanks;

Jeb

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captaink

04-21-2005 08:56:27

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Re: Super A 12V resistors in reply to Jeb2N, 04-21-2005 07:11:03

Depending on how original you want to keep this tractor, you can get a DPDT (double poll, double throw) flip switch from Radio Shack or an automotive store. This switch has two separate circuits in it; you use one circuit for the ignition and the other for the exciter wire to the alternator. This way you don�t need a light or diode, :>) but the switch will not look original either. :<(

You could also wire in a DPDT relay between the original switch and the ignition/exciter wires. The original switch would power the relay which would in turn activate the two circuits coming out of it. That would keep originality on the switch, but will add another mechanical part (relay) and cost to the wiring.

Just giving you options�

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Bob M

04-21-2005 08:05:37

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Re: Super A 12V resistors in reply to Jeb2N, 04-21-2005 07:11:03

You'll need a resistor with a value between about 12 and 40 ohms, and rated at 1 watt or higher. However to wire in a "Radio Shack" resistor in you will need to solder it, same as if you use a diode.

My preference however is to use a lamp - especially if others are gonna be running the tractor. I've mounted lamps by drilling a small 14 ga sheet metal scrap, mounting the lampholder in the sheet metal piece then bolting the whole business to the steering post under one of the mounting bolts for the ammeter box.

Punch below for a wiring diagram. If you elect to use a resistor simply wire it in place of the lamp in the diagram...

wiring diagram

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