Assuming 1.4 ohms is correct for your coil, you need somewhere around 0.5 to 0.7 ohms for the resistor.
Tell us more about the coil. Manufacturer, part number, etc. 1.4 ohms sounds like it may be an HEI type coil. I'd expect the primary coil winding to be more like 3 to 4 ohms for a 12 volt points type coil.
Last edited by Bill Hanlon; 04/25/2026 12:16 AM.
'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.
| 
