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Re: Farmall B - no spark.
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Posted by Janicholson on October 04, 2005 at 11:19:19 from (199.17.6.175):
In Reply to: Farmall B - no spark. posted by Dave H (MI) on October 04, 2005 at 11:00:26:
The can like thing is the ignition coil. it may be the issue causing no spark. However these may help. There are three wires connected to the coil.
1 comes from the ignition switch (maybe through a resistor)then to the positive side of the coil.
2 connects to the negative side of the coil and attaches to the side of the distributor with a small nut arrangement.
3 is a larger wire connecting the coil tower (plastic nipple protrusion) to the distributor cap center. If the coil is warming up, it is getting voltage. If the coil is marked 12v for resistor only, or words to that effect, it needs the resistor in the supply line. The resistor is usually a ceramic block about thumb sized but square. It has one wire in (from switch) and one wire out to coil +. If it does not have this resistor and the coil is original (6v) it has been getting too much voltage and may be burnt out. If the coil is for use with a resistor, and there is none this will cause the coil to go bad. Using a coil from another 12 volt machine will work to test the fix. Wire it as described above. The points (inside the distributor may be out of adjustment, they should be set to .020" when their rubbing block is on the high point of the ignition cam (inside the dstributor).
Good luck with it. JimN
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