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12 volt conversions

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Dave Grubb

09-25-2000 09:36:36




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For everyone converting to 12 volt ignition systems: you must replace the points condensor. This unit acts as an electrical shock absorber. When the points open, the condensor absorbes the sudden voltage potential, thus preventing the voltage from arcing across the open points and burning them. Going from 6 volts to 12 volts doubles the voltage and the potential to be absorbed. The condensor will eventually fail electrically. This is usually noticed by a total failure of the engine to start or the engine starts the moment the starter is released. Most any common 12 volt condensor will work as long as it is the same physical size as your 6 volt unit. Also, for those using the Chrysler type ceramic ignition coil resistors: they will also fail in time and usually cause a start upon release of the start at just the right moment. I hope this helps someone out there.

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Dave

09-29-2000 18:49:29




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 Re: 12 volt conversions in reply to Dave Grubb, 09-25-2000 09:36:36  
RJB,
I got this information from the article archives on this site. I think your coil said use an external resistor. The 6 v coil is somewhere around 1.5 - 1.6 ohms. You place a 1.5 ohm resistor in series to use it on 12v. Your 12 v coil with an internal resistor should be about 3 ohms. Dave



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Butch (OH)

09-25-2000 12:46:37




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 Re: 12 volt conversions in reply to Dave Grubb, 09-25-2000 09:36:36  
Seems to be a lot of confusion on this subject. For those of you don't know about them. The Delco battery ignitions were never 12volt to start with. The GM automotive units (cars) used a resistier wire to run the system at about 6-8 volts except when the starting solinoid was engaged, same with Chrysler except they used the ceramic resister in leu of the wire. There was another feed wire from the solinoid to feed battery voltage to the coil when starting.When either of those resisters failed the vehicle would start due to the resister by-pass circuit and then die when the key was released. The Delco battery ignitions used in 12-volt A-C tractors used a coil with an internal resister to reduce the primary voltage. It is important to either use the proper coil or to install an ignition resister when they are replaced. All you need to do to convert yout ignition system from 6 to 12 volt is to install a resister in the line feeding the coil. Dave is correct that the condensor is an electrical shock absorber, but it doesn't know if it is being fed by a 6 volt system or by a 12 volt system reduced to 6 by an ignition resister.

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RJB

09-29-2000 12:13:10




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 Re: Re: 12 volt conversions in reply to Butch (OH), 09-25-2000 12:46:37  
Butch I am now confussed?
All I did when converting from 6 to 12 was I got a 12 volt gen. and put a 12 volt coil that said for use with a external regulator. Is this the wrong coil? I figured that the regulator on the gen. is what the coil is referring to.
Am I right or do I have the wrong coil?
Thanks Ron P.S. my coil was bad so instead of buying a ceramic resister and a new 6 volt coil I thought it to be better to buy a 12 volt coil.

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