Posted by DanielW on May 24, 2023 at 07:49:13 from (24.51.248.85):
In Reply to: Coils posted by muleman51 on May 24, 2023 at 05:40:22:
What coil are you using? As mentioned, if 12V and no ballast resistor, it should have 3 OHM resistance across the primary. I've found the best 12V, 3 OHM coils are the NAPA IC14. The fancy-pants ones like the Pertronix coils sometimes don't seem to last, but I've never had to replace an IC14 (and I've used lots). Just make sure you get the IC14 (or ECH-IC14), and not the IC14-SB. The SB is the cheaper Chinese one, and they don't last. The regular IC14 (or ECH) is the Echlin one - much better quality.
Keep in mind that problems down-stream of the dizzy can damage a coil: Bad plugs or plugs with improper gap can cause the voltage required to jump the gap to skyrocket, which can eventually damage the insulation in the coil's secondary. Even more common is bad plug wires with too high resistance (either from damage/wear, or from being the wrong type), which causes the same problem. An alternator/generator that's putting out significantly more than 14.4V can burn up the primary windings (a common problem on the old N's with the front mount dizzy's, where people have put in those wacky 8V batteries and cranked up the generator output to suit).
If you're buying good quality 12V coils that don't require a ballast resistor (assuming there's no resistor on the 2510), then I would suspect frequently blown coils are a manifestation of another problem. Start with plug/coil wires as that's the most common cause. I'm assuming you're still running points/condenser, in which case you should have copper-core wires, not the carbon/suppression wires. There's been lots of debate on that subject and tractors will run with both types, but I ascribe quite strongly to the school of thought that carbon/suppression wires will demand too much coil voltage from a conventional system and end up burning up the secondary windings. If the high tension leads are ok, check charging voltage, plug quality/gap, and look for other electrical gremlins. And, of course, the condenser too, but I'm assuming you've already checked this. Lots of lousy condensers can start to cause issues when they're hot.
Whatever the case, 1-2 years sounds like far too short of a lifespan for a good coil.
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