Posted by John T on May 15, 2011 at 05:44:20 from (173.243.189.183):
In Reply to: Dumb question posted by notjustair on May 14, 2011 at 19:26:17:
Theres no dumb questions, but one does see dumb answers now n then.
Your basically correct, YES you can use the same points regardless if on a 6 or 12 volt system. The points are a current switching device with a voltage withstand rating FAR FAR HIGHER THEN 6 OR 12 VOLTS ANYWAY...
The points are designed to switch in the vicinity of 4 amps or so but if thats increased drastically they will burn up pretty fast. HOWEVER in a 6 or 12 volt system, that coil current is still close to the same (i.e. 4 amps or so or less)
In a 12 volt system the total primary (coil + any ballast) resistance is around 3 ohms and 12/3 = 4 amps. In a 6 volt system, the total primary resistance is around 1.5 ohms and 6/1.5 again = 4 amps.
If you use a 6 volt coil (around 1.5 ohms) and a series ballast (around 1.5 ohms) on a 12 volt system, the points switch around 4 amps (12/3) ,,,,,,,,,same current as if you used a unballasted 12 volt coil (around 3 ohms),,,,,,,,,same as if you used a 6 volt coil (1.5 ohms) on a 6 volt tractor......
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