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12 volt conversion, Resistor question

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screaminghollow

08-19-2002 19:55:09

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I'm not real good at understanding circuits, etc. I was trying real hard to pay attention to the diagrams etc. There was nothing attached to the terminals for the original resistor and the thing ran fine as a six volt. When I tried to unscrew the nut on one side of the resistor terminals, the whole #@&!# thing disintegrated, even though I put a few drops of "three in one" oil on them the night before. This brings me to the question, I got a 12 volt coil in my tisco kit. Do I need a resister at all? The kit came with a resistor and the Tisco diagram shows it being wired in line with the old resister. On the other hand, another diagram shows no resister whatever, if you use a coil with a built in resistor. Does the 12 volt coil from Tisco have a built in resistor? I am going with Dell's suggestion to use a three wire hook up from the alternator.

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Jim WI

08-20-2002 10:27:04

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Re: 12 volt conversion, Resistor question in reply to screaminghollow, 08-19-2002 19:55:09

If the drawing that came with the kit shows it wired with both the OEM resistor and an additional resistor, I'd do it that way first (maybe it's not a 12v coil after all?). It certainly won't hurt anything -- worst case is that it won't run (or will run really badly).

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Phil (NJ-AZ-SK)

08-20-2002 06:46:36

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Re: 12 volt conversion, Resistor question in reply to screaminghollow, 08-19-2002 19:55:09

scream, You need to measure the Resistance of the COIL. If its ~ (near to) 1.0 Ohm .. add the ballast resistors, in series.

If its ~ (near to) 3.0 Ohms add the (Dell) resistive Combo or.. use "TWO" standard ballasts in Parallel.

JMHO

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Dell (WA)

08-19-2002 22:30:07

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Re: 12 volt conversion, Resistor question in reply to screaminghollow, 08-19-2002 19:55:09

Screammer..... ..... ..I had to research the archives to find out that you have a frontmount 8N. And that for 10 years you've been operating your tractor without the 6 volt generator ever charging your 6 volt battery. And that you would recharge your battery every couple of days and keep on going. You must have the patience of a saint. I would NOT put up with that kinda nonsense..... . EVER..... .

Since I have never seen the latest TISCO 12 volt conversion kit for the frontmount 8N and don't know what the "resistor value really is" and I don't know for certain that the included frontmount coil is really a 12 volt coil. I'm going to have to take your word for it.

If in deed, your new frontmount coil is the 12 volt version, YOU WILL NEED a current limiting resistor to keep from burning out the new 12 volt coil. It does NOT have a built-in resistor. And since you haven't told me the ohmic value of the TISCO supplied ceramic resistor (its usually printed on it) You need about 1/2 ohms 20 watts.

I'm going to tell you what I know works. Go to Radio Shack (or eqv) and buy a 2-pack of 1 ohm, 10 watt resistors. Wrap and solder the leads together so you have 2 resistors side-by-side. You now have the electrical equivalent of 1/2 ohms 20 watt resistor. Wire this current limiting resistor between the ignition switch and the coil terminal. DO NOT USE ANY OTHER RESISTORS. NOT the TISCO resistor, NOT the infamous ballast resistor that crumbled in your hands. NO other resistors UNDERSTAND????

I hope you understand the scheme behind using the Delco SI-10 3-wire 12 volt alternator. Good choice..... ..... Dell

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Mountainman

08-19-2002 21:46:58

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Re: 12 volt conversion, Resistor question in reply to screaminghollow, 08-19-2002 19:55:09

I haven't seen the Tisco kit but it sounds like the included "resistor" is for dropping 12 volts to 6 volts.
If you have a front mount coil (12 volt) you need a resistor but not the original nor the one included in the kit. Dell says get one at Radio Shack or equivlent, but I got a resistor for a '57 chevy and it works for me. Others have used resistors from Chysler cars of the 'points' era. Ultimately, you need to get 8 to 10.5 volts at the coil top terminal, engine off, ign on, points closed, and battery voltage with points open.
Follow Dell's instructions for the three wire alt. hook up, you will be glad you did. Solder your terminals and use heat shrink to cover the ends. Do a neat job; be proud. It will remain trouble free for a long time too.

Hope this helps.

Mountainman...CA

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Wayne Mo

08-19-2002 20:26:37

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Re: 12 volt conversion, Resistor question in reply to screaminghollow, 08-19-2002 19:55:09

You likely need to use the resister to drop from 12v to 6v. The infamous heat sensitive resister on the dash was for 9N and old style 8N with front distributor and is not used on late model side distributor 8N's. If you have a side distributor model there is a terminal block but it is not a resistor. I imagine the Tisco unit is a normal 12v coil that needs the dropping resister included in the kit.. Dell and others will know...

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