Valuable model a 12 volt wiring diagram - Be aware: the subsequent coil tester description and layout originated with tom wesenberg, it's miles reprinted here with permission of the writer as a service to fellow version a hobbyists. On behalf of marc i would love to thank tom for his generosity. Frank pollack 2009 president, marc. I'm displaying a slant pole coil as used on 1928 and 1929 model a’s. In november 1929 the service bulletins indicates the wiring modified so the driver’s aspect of the coil now's the bad electricity aspect terminal and the passenger facet terminal will lead to the points, and ground. To test the later coils i'd clearly opposite the two coil terminal clips.
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Here is a coil and condenser tester i made for about $nine. The 6 volt relay is 35 ohms and the capacitor linked to the relay windings is 330 microfarads. This combination makes the relay vibrate at a price to give the coil the same frequency as a model a running at 1,000 rpm. The higher the capacitance, the slower the relay will vibrate. If you use a 6 volt relay with a one of a kind ohm reading, you’ll ought to experiment with one of a kind capacitance to discover the frequency you want for trying out the coil.