Posted by John T on September 23, 2009 at 06:00:22 from (66.244.97.31):
In Reply to: Super M points posted by jeffalex2 on September 23, 2009 at 03:50:02:
You could have a coil and ballast mis match whereby the ballast is dropping too much voltage leaving less then 6 volts on the new 6 volt rated coil......
Put a voltmeter on the coils input (or low output side of ballast, same point electrically) and with ignition ON and a good set of points closed READ THE VOLTAGE it should be near 6 to 7 or so volts BUTTTTTTT if its real low like 4 or 5 the ballast resistance is too high which lowers the spark energy.
On that 12 volt tractor you need EITHER a 6 volt coil and a correct ohms ballast resistor which is approx the same ohms as the coils primary (50 50 voltage divider) OR ELSE a full ture 12 volt (some call them internally ballasted) coil NO ballast required.
NOTE A full ture 12 volt (some call internally ballasted) coil may be labeled "12 volts" OR "12 volts NOT for use with external ballast resistor"
HOWEVER a coil labeled "12 volts for use with ballast resistor" is in reality a 6 votl coil an dneeds a ballast JUST LIKE IT SAYS
Check the points to be sure they didnt get burned carboned or pitted and replace them if necessary. If theres any doubt for no more then they cost a new set of points and condensor and/or the correct sized ballast (if coil voltage too low per above) may cure the problem..
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