In Reply to: 9N Spark/No Spark posted by John Parker on January 20, 2019 at 12:05:50:
How are you 'losing spark' and how are you checking for spark? If tractor starts and runs for a few minutes then quits, seems to me it is a more of a fuel issue. Do you have the fuel sediment bulb valve open 2 Turns? Have you performed the fuel flow test? By the way, what are sleeve bearings??? If you pass spark and fuel flow test, the next step is wiring. And, NO, NO, NO, EI or a 12V switch out job is not a fix for your issues. If it ain't running now on 6-VOLTS, how will these fix the problem??? Don't be sucked into that mental-midget thinking 12v or EI is better; they have their merits, but in no way are they the cure-all for non-starting/non-running 6V/POS GRN systems. Your 6V/POS GRN wiring should have the OEM Ballast Resistor, 6V coil, ammeter, 1-wire starter motor with NO solenoid, 1 wire/3-Brush generator, Round Can Cutout; ignition switch, and neutral safety starter pushbutton. Lights were options. If you have them disconnect until you find the true root cause of your problem. Do you have an I&T FO-4 manual?
OEM 9N-12250-B BALLAST RESISTOR: