Posted by John T on October 20, 2013 at 07:11:33 from (173.131.158.218):
In Reply to: Farmall M No Spark posted by Farmall Don on October 19, 2013 at 18:42:01:
The coil input from the IGN switch (when ON) should, of course, always read 12 volts to ground HOWEVER the other to distributor coil wire is usually zero volts if the points are closed AND IF GOOD AND NOT BURNED AND NOT BADLY CARBONED!!!
When the ign is on and the engine slowly cranked over a test light on the coils to dist terminal should flash ON (points are open) and OFF (points closed).
If she never flashes off the points are bad or not closing, if she never comes on the coil is bad/open or the condenser may be shorted or the points shorted or the wires bad to dist or its shorted out.
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