Found this little dwg. on the net for checking coils polarity other than the conventional lead pencil test and the vendors' tester. No specificity for 12 volt neg. vs 6 volt pos. systems.
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Chicagoland mg club has the best explanation I've ever seen.
http://www.chicagolandmgclub.com/tec...neral/574.html
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Thanks Tom, wondered if or where the dwg. came from. A few paragraphs down, it says there's no difference in connecting the test leads to read the analogue meter for + or - ground systems ( even assuming the coils are marked + or - but also assuming as taught by theory that electrons flow across the battery from + to -).Last edited by plyfor; 11-24-2017, 09:25 PM.
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Our 12 volt ( negative ground) coil terminals are marked; so in summary, the ignition switch red wire is the ground leg and goes to the neg.coil terminal. The black wire runs from the + coil terminal to the + j box terminal.
Would assume since the coil is marked that no polarity check would be required.
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some info says the plus is where to check the high voltage, and another says use the minus. I also have seen wiring diagrams showing comman internal connection on both plus and minus. Are different coils wired differently to the + - terminals? Also, I get the same ohm reading from the hi tension tower to either plus or minus. This is on several coils that spark well.
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by canadianI have read about the big no no about mounting a ignition coil, terminals down on Model A firewall. I have a NAPA 12V internal resistor mounted upside down for 3 years. Brother rumbles by with 72 dodge Demon , nice 340 , while looking around I noticed ignition coil bolted on its side to intake manifold , factory dodge design. the same coil that I am using exactly, He says its been there for 15 plus...
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Channel: Model A Forum
05-12-2018, 06:18 AM -
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can the 6V tester be used for twelve volt? What changes would be needed to test 12V coils?...
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Channel: Model A Forum
02-16-2018, 10:55 PM -
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by BudPI am looking for some guidance on testing a 6 volt coil with an analog meter. I presume side post to side post will check the primary windings but what should be the setting on the analog meter and what range of numbers constitute an acceptable reading? Almost the same question with regard to checking the secondary windings. I presume side post to center is proper but which side post and what constitutes...
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Channel: Model A Forum
06-11-2017, 02:07 PM -
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by Cape CodderI am looking to purchase a coil other than OIL filled. I see that Summit Racing sells Per Tronix Ignition Coils which are EPOXY filled and Primary Resistance is 1.5 ohms with maximum voltage rated at 40,000 volts.
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How does this coil match up to the original coll in that it is filled with EPOXY and voltage rated at 40,000 volts?
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Channel: Model A Forum
10-05-2018, 03:32 PM -
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by plyforAttached is a dwg. from the net that may be helpful. It also shows how to locate a condenser away from the dizzy and up at the firewall. If an oil filled coil is used, the diagram has the terminals facing up requiring a longer coil to dizzy wire....
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Channel: Model A Forum
02-13-2018, 06:15 PM -
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by plyforWe picked up a (12 volt) Standard -no resistor required- UC15T oil filled coil. The oil does slosh around inside. Research suggests these cylinder types can cool better than epoxy filled when the terminals are facing up. The Model A's have the terminals facing down. Does anyone have concerns about this?
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Channel: Model A Forum
11-07-2017, 12:09 AM -
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by MitchCOIL TESTER
Coil Tester
By Tom Wesenberg
Here is a coil and condenser tester I made for about $9. The 6 volt relay is 35 ohms and the capacitor connected to the relay windings is 330 microfarads. This combination makes the relay vibrate at a rate to give the coil the same frequency as a Model A running at 1,000 RPM. The higher the capacitance, the slower the relay...-
Channel: Tune-up ~ Performance
08-06-2018, 07:21 AM -
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