Posted by FrankxR on August 15, 2012 at 19:05:18 from (75.105.79.140):
I am trying to chase down a problem of no spark in a Fcub (six volt + ground system). I cannot get the coil to fire. Neither the new one or the old one. There is six volts on the -side of the coil and I am using a starter (hot wire) switch to ground the + coil primary. You can see on the tractor amp meter that there is good current draw on grounding the coil . On the HV side I have inserted a spark tester and attached this to a ground. Opening and closing the primary switch is not giving me a spark. I have already replaced the ignition switch because it was displaying high resistance due to a low voltage on the battery side of the coil ( as low as 3.5 volts ) when grounded. Now when the coil is grounded the voltage stays around 6 volts. Am I testing this coil properly? Is it possible that the battery has too much resistance? I sort think not due to the size of the deflection on the amp meter.
The big difference between the old coil and the new coil is the primary resistance. The old was about 22 ohms and the new is about 1.7 ohms. The old has 10.5 Kohm from HV out to the primary coil and could not measure ohms to case due rubber coating on case. The new has a metal case and gives 8.5 Kohms from HV out to primary coil and is open to case.
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