Posted by John T on October 24, 2014 at 09:09:38 from (216.249.72.121):
In Reply to: Cub LoBoy Coil posted by bob landers on October 24, 2014 at 08:43:20:
If you work through my Ignition troubleshooting procedure it can help find the problem. As the points are usually closed if all is well and wired right there's usually no voltage (with respect to ground) on the coils output (to distributor) terminal, see my procedure.
"First question: shouldn't the coil have some resistance, maybe a few ohms?"
YES the coils LV primary between the little + and - terminals should be continuous and have a resistance of around 1.2 to 2 ohms for a 6 volt or 2.5 to 4 ohms for a 12 volt coil.
"Second question: If it's bad and I think it is, would it better to get the hotter coil that requires external resistance?"
While a 6 volt coil would require a series voltage dropping (12 down to 6) ballast resistor if used on a 12 volt tractor, I wouldn't think of that as a HOTTER coil as you asked.
On a 12 volt tractor you can EITHER use a full true 12 volt coil (NO Ballast required) or a 6 volt coil PLUS the ballast. A 12 volt is easier and needs less wiring and no ballast etc. to fool with.
One reason however to use a 6 on a 12 volt tractor is if you have a ballast by pass circuit/system is it can improve starting (hotter spark) in cold weather
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