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If using the original-style coil for the front-mount distributor, this actually works at about 3.5 volts. To get this from 12 volts, you'll need two voltage reducer resistors, in series. The ones sold by the excellent sponsors of this board will work fine, or look for General part number RU-100. These go, in series, somewhere in the wire that runs to the terminal on top of the coil. Howsomever - I suspect that if you were running the original style coil on 12 volts with no reducer, you would have fried the coil by now. There are coils available in the same package style which are wound to work at 6 volts (one reducer). You may have one of these, and it would last for a while with no reducer. The rule of thumb developed by Andy Gallup of Genesee Products, and most excellently detailed in the Autumn 1999 issue of the N-Newsletter, is that the total resistance of the primary circuit in any 12 volt conversion should be 3 ohms ± 10%. If you can measure the resistance of the coil primary accurately (within 1/10 of an ohm), subtract that from 3 to find the amount of ballast (reducer) resistance you need to add - if any. For your reference, the "original" front mount coil has a primary resistance of the order of 0.7 ohms, while a "6 volt" version of this coil will have a resistance more of the order of 1.5 ohms. HTH, llater, llamas
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