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Simple Question
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Just need a simple answer! Thanks!

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Andy - Hammond,

03-18-2001 06:26:20




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Do I need to use ANY ballast resistors inline if my entire system is 12V? I have a front-mount distributor - been coverted to 12V coil - all parts brand new with brand new SI10 Delco Alternator. Everything working ok! I just need to know if I need any resistors with an all 12V system. My local '8N depot' (tractor fixer-upper and seller) says I still need a slight ceramic resistor and sold me one for around $2-3 when I bought my new 12V ignition coil.

Thanks for the input.
Andy

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Jim in Pensacola

03-18-2001 07:07:45




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 Re: Simple Question - Just need a simple answer! Thanks! in reply to Andy - Hammond, LA, 03-18-2001 06:26:20  
Andy, Yes I agree with the first two responses. I was one of Dell's helpeees. He said to ensure that no more than 13 volts maximum of power is supplied to the (+) terminal of the coil when the engine is running and the alternator is suppling the energy (roughly 14.7 volts output from most alternators). This means that when the engine is not running (only batt voltage) the voltage at the (+) terminal of the coil should only be 11 volts (max) with about 9 volts (min) with the points closed. ((You can not get a reliable voltage reading at the (+) terminal with the engine running is why we do it with the engine not running)) You can try to get an after market resistor to give you this 9 to 11 volt reading, but I found (two week ago) that two of the orginal ballast resistor wired in parallel gave me 10.5 volts at the (+) terminal with the points closed (remember - engine not running)


I don't know the electrical reasons why, I just tried to meet the 13 volts max while running requirement!!!!

Good luck, Jim

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Phil (AZ)

03-18-2001 09:23:26




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 Re: Re: Simple Question - Just need a simple answer! Thanks! in reply to Jim in Pensacola, 03-18-2001 07:07:45  
JiM
Post:"I found (two week ago) that two of the orginal ballast resistor wired in parallel gave me 10.5 volts at the (+) terminal"

You have the "only" solution, the two Ballast Resistors will maintain the ~ 10.5 Volts regardless of the Voltages applied. Those that put only "ONE" will find that they don't have current limiting or they will pick one that reduces the efficiency of the coil.

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CRS in AL.

03-18-2001 06:45:38




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 Re: Simple Question - Just need a simple answer! Thanks! in reply to Andy - Hammond, LA, 03-18-2001 06:26:20  
ANDY, you do need a resistor to extend the life of points and condencer. With out it they will burn out quick. (Tie in the resistor to wire that goes to the plus (+) side of the coil.)



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Jim(MO)

03-18-2001 06:39:09




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 Re: Simple Question - Just need a simple answer! Thanks! in reply to Andy - Hammond, LA, 03-18-2001 06:26:20  
Yes you do. All will seem fine for awhile until the coil overheats and it quits.Good possibility of ruining your new coil. The alternator puts to much voltage to it. Don't remember the exact voltages. Look up some of Dell(WA)'s old posts for more info.

Been there, done that.
Jim



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Andy - Hammond, LA

03-18-2001 07:17:35




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 Re: Re: Simple Question - Just need a simple answer! Thanks! in reply to Jim(MO), 03-18-2001 06:39:09  
DO you know the exact type and part # for the resistor I need? I was sold a ceramic block resistor for mounting on firewall area behind dash. Here is a pic.

third party image

Thanks
Andy



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Dell (WA)

03-18-2001 11:58:22




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 Re: Re: Re: Simple Question - Just need a simple answer! Thanks! in reply to Andy - Hammond, LA, 03-18-2001 07:17:35  
Andy..... .many companys make a "useable" resistor of about 0.4 to 0.5 ohms at 20 - 25 watts, and naturally, they put their own part number on it. That is why I don't tell people a part number to buy.

Its just like buying tires, you buy by size required and GoodStonaha will all have their own p/n's.

Note: these values are not too critical but most everyday ohm meters cannot accurately measure less than 1 ohm for many technical reasons, you need electronics lab grade $500+ meters to do that anyways.

BTW, nice lookin' power resistor, if'n about 0.5 ohms, probably do you just fine..... ...Dell

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