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Robshicla, The correct total "circuit" resistance for "ANY" front mount coil is 4.83 Ohms. The normal 12 volt coil has a resistance of 2.5 ohms which means you need ~ 2.33 ohms of additional resistance. Singe Ignition resisters do not come that "large" (2.33 Ohms), 1.7 ohms is near Max "Hobo" found that the OEM ballast Resistor followed by a 1.1 ohm Ignition Resistor worked reliably with the 12 volt 2.5 ohm Coil. If you want to do it absolutely right you need to measure the total circuit resistance, but there is a twist, because the OEM ballast will measure 1.0 ohm "less" than its operating resistance. That means that if you use an OEM ballast the "measured" total resistance will be correct at ~3.83 ohms. (The Total Circuit resistance includes the points & Ignition Switch) You will eventually burn out the coil if you operate it with more than 3 amps, your choice Yes! you need the diode, it will protect the Alternator from loading damage. The diode trio, in the alternator, feeds the regulator circuit
"unloaded". If a diode (trio) shorts, from over loading, your ignition system & Alternator will go up in smoke. JMHO
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