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12 v conversion

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kevinthefixer
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PostPosted: Wed Dec 06, 2017 6:46 pm    Post subject: Re: 12 v conversion Reply to specific post Reply with quote

Yes, the condensers are the same on 6 or 12V systems, but they need to be rated at much higher voltages than that. If you look at an old automotive oscilloscope in action, the primary spikes will run around 30V on a healthy system. One with an open (or disconnected) plug wire or even just a wide plug gap can easily exceed 50V. An ignition condenser should be rated 100V or better, but I doubt most of the ones you buy today are. Certainly the days of leaving the condenser in for 50,000 miles are over.
 
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CathyCase
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PostPosted: Wed Dec 06, 2017 9:08 pm    Post subject: Re: 12 v conversion Reply to specific post Reply with quote

Thanks so much, this explination was very helpful

quote="CVPost-rvirgil_KS"](quoted from post at 10:17:26 12/05/17) There are 2 types of coils labeled for 12 volts. One is labeled ?12 volts use external resistor? and the other labeled ?12 volts, no external resistor required?. The first has about 1 1/2 ohms resistance across + an ? terminals of the coil, the second has about 3 ohms. The difference is in the wire used to wind the coils, there is no added resistor in series with the coil inside the can. You could use the ?external resistor required? coil on a 6 volt system and eliminate the resistor.

The purpose of the resistance is to limit current through points and coil to about 4 amps. With the external resistor limiting the current it divides the supply voltage across coil and resistor so you see 6 volts dropped across each one.

With positive ground the + terminal should go to the side of distributor, with negative ground the ? goes to distributor. The coil doesn?t care which way it is wired, the difference has to do with the spark plug. If the coil is wired to match battery polarity the plug will ?spit? the spark from center electrode to ground tab. If coil polarity is reversed the plug will ?suck? the spark from ground tab to center electrode. The plug is more efficient if it ?spits? rather than ?sucks? the spark.

There is no distinction between a 6 volt and 12 volt condenser. If you could find specs on a condenser you would find they are actually rated for several hundred volts.

If you understand a 6 volt system, you understand a 12 volt system. They work the same. Difference is in amount of resistance in circuit to limit coil/points current.

Positive or negative ground is like right hand or left hand threads on a bolt. With bolts the nuts turn in opposite directions, with battery system current flows in opposite directions. Positive or negative ground should work equally well if polarity sensitive components such as ammeter, coil, and charging system are all configured to match battery polarity.

Make sure you have good quality battery cables and connections on both ends of both cables are clean and tight.[/quote]
 
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