Before buying a new ballast resistor do one more test.
With the distributor cap off, turn the engine over until the points are closed. With the key still on measure the "other" side of the ballast resistor to ground. Should be very near the reading with the points open. This is just to test for very little resistance between the battery and the ballast resistor.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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