Make sure that the rotor spring or contact is making contact with the button on the top center of the distributor cap. Measure the distance from the center of the rotor to its outside edge and make sure it is wide enough to pass over the outlying terminals on the distributor. Often the terminals will have L-shaped cut out so the rotor arm comes close to the teminals at both the side and vertical gap.
I ran into exactly this problem with a friends late 60s Barracuda. The replacement rotor or cap was not high enough to touch the button on the cap or the rotor arm was not long enough or high enough to come into close proximity to the cap outer contacts. What many people don't realize is that the spark generated by the coil has to jump a very short gap between the rotor arm and the cap terminals.
I just read that the rotor clearance between the arm and the terminals should be between 0.10 to 0.035 inch. I would double check this.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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