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12V conversion clarification

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Dan (WA)

11-07-2004 18:31:38

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Sorry to beat this topic to death, but just need a clarification. When doing a 12 Volt conversion on my 9N using a 12V coil, should the only resistor in the circuit be the ballast resistor on the terminal block on the back of the dash? Or does it come out? Thanks,Dan

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Bob

11-07-2004 18:35:43

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Re: 12V conversion clarification in reply to Dan (WA), 11-07-2004 18:31:38

With a "12 Volt" front-mount coil, the original ballast resistor is "OUT", and a 1/2 OHM 20 WATT "current limiting" resistor is "IN".

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Gary Prestridge

11-07-2004 18:56:25

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Re: 12V conversion clarification in reply to Bob, 11-07-2004 18:35:43

I am thoroughly confused(don't take much)I am hoping that this is some of my rough running problem, I wired it according to advice from another forum several months ago..I will be as brief as possible. Currently I have 10si alternator,3 post switch(Acc,Ign,Batt)and ballast resistor....#1 terminal wire on alt going to Acc on switch..output wire on alt going to bottom post on ballast resistor..one side of ampmeter going to bottom post on ballast resistor..wire from other side of ampmeter to battery side of solenoid..ign post on switch to top left post on ballast resistor...Bat post on switch to bottom post on ballast resistor...top right terminal on ballast resistor to 12V coil..What do I need to do different? Thanks

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Bob

11-07-2004 19:09:15

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Re: 12V conversion clarification in reply to Gary Prestridge, 11-07-2004 18:56:25

Wire it acccording the the diagram 4TH from the top HERE:

Link

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Gary Prestridge

11-08-2004 04:11:40

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Re: 12V conversion clarification in reply to Bob, 11-07-2004 19:09:15

Where do I get the 2 terminal junction block? The "resistor" part comes off separate on the 3 post ballast resistor, so can it just be removed and use two post on this one? If so, which two?

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Bob

11-08-2004 06:22:44

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Re: 12V conversion clarification in reply to Gary Prestridge, 11-08-2004 04:11:40

You could replace the juction block with one for a later "side-mount distributor" 8N, or you could continue to use the one you have. You already have one separate terminal. For the second terminal, just use one of the other two that the original resistor is connected to, and IGNORE the other terminal the original resistor is connected to.

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Bob

11-07-2004 19:14:34

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Re: 12V conversion clarification in reply to Bob, 11-07-2004 19:09:15

P.S.

Your's will be different than that diagram because you have your alternator #1 (excite) wire hooked to the ACC terminal on your ignition switch. That's OK as it is, and , of course, you don't have the "idiot light".

Another feature of that diagram that many take issue with is the headlight switch being fed by the ignition switch. While the feature of the headlights being shut off when the ignition is off is a nice feature, the added load is NOT the best thing for the ignition switch.

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Dan (WA)

11-07-2004 19:11:24

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Re: 12V conversion clarification in reply to Bob, 11-07-2004 19:09:15

Do you have a Brand & part number or where to get the 1/2 ohm 20 watt resistor? Thanks,
Dan

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Dell (WA)

11-07-2004 19:23:21

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Re: 12V conversion clarification in reply to Dan (WA), 11-07-2004 19:11:24

Dan..... ....gitta RadioShack p/n 271-131, 1-ohm, 10-watt 2-pack and twist and solder the resistors wire leads side-by-side and make a 1/2-ohm 20-watt 12 volt squarecan ignition coil current limiting resistor inplace of your frontmount "infamous ballast resistor". Altho iff'n you know your way around enny big-city electronics industrial parts store, a 0.47 25 watt power resistor will also doitt. (often used in POWER transistor ampliers for current balance control, thats abuncha technical jargon)..... ...Dell, a 12 volt advocate for the right reason

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Doug Overkill

11-07-2004 19:15:08

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Re: 12V conversion clarification in reply to Dan (WA), 11-07-2004 19:11:24

Yes. 12 Volt systems remove the Ballast resistor, it is the wrong rating. What you want is a 2-pack of radioshack 1-ohm power resistors ,part number 271-131, twisted together in parallel.
The math says two 1 ohm in parallel = 1/2 ohm Radio Shack p/n : 271-131

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Bob

11-07-2004 19:21:30

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Re: 12V conversion clarification in reply to Doug Overkill, 11-07-2004 19:15:08

Any electronics distributor should be able to set you up with 2 - 10 Watt, 1 Ohm ceramic power resistors, which when connected in parallel, make a 1/2 Ohm, 20 Watt resistor.

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