Posted by John T on July 06, 2014 at 04:58:06 from (216.249.72.121):
In Reply to: Farmall M, no spark posted by bja105 on July 05, 2014 at 19:09:39:
Lets take your questions one at a time:
1) "He has 12.3v to a resistor or something just above the coil, 9.3v to the coil. It is a 12v coil."
If its indeed a 12 volt coil??? THERE SHOULD NOT BE ANY EXTERNAL SERIES BALLAST RESISTOR USED or the spark will be weak. A full true 12 volt coil may be labeled "12 Volts" or "12 Volts NOT for use with ballast" or "12 Volts No ballast required"
2) "What is that ceramic device above the coil and distributor?"
Its a series voltage dropping (usually 12 to 6) Ballast Resistor. Its used if the tractor is a 12 volt but the coil is a 6 volt so it drops 6 leaving 6 for the 6 volt coil.
3) "Does it belong on a 12 volt tractor?"
NOOOOOOOOOOOOOOOOOOOOO if a 12 volt coil is used
YESSSSSSSSSSSSSSSSSSS if a 6 volt coil is used
4) "Rather than throw parts at it, how do I troubleshoot this?"
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