Posted by mkirsch on January 15, 2009 at 09:46:27 from (64.80.108.56):
In Reply to: Farmall M wont start posted by Kelly001 on January 14, 2009 at 17:22:44:
OP said he replaced the coil.
If you wire the coil backwards you'll get a weak spark and the tractor won't run.
If you get a 12V coil with internal resistor by mistake on a 6V system, you'll get a weak spark and the tractor won't run.
Do the old trick your dad taught you with the lawnmower: Pull the plug, put it back on the plug wire, lay it against the engine, and crank it over. If you get a bright blue spark, it's on to the next piece of the puzzle. Weak and yellow, and you've got your problem narrowed down.
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