Posted by 87nassaublue on February 13, 2010 at 01:04:48 from (72.15.97.115):
In Reply to: hard starting tractor posted by Leyland-270 on February 12, 2010 at 20:08:21:
I had that problem with an old Ford truck that did not have a ballast resistor coil. When the battery got weak and I tried to start it, the current to run the starter would pull the voltage at the coil down so low it wouldn't fire. As soon as I let off the key in the start position, the voltage at the coil would come up and the engine would start because it was still turning over.
You did mention that this was a 12 volt conversion. It sounds like when you did your conversion, you used a "ballast coil" and a ballast resister. Did you also install a circuit/starter switch that would bypass the ballast resister when you run the starter motor? If you didn't change your starter switch to that type, you could add a simple circuit with a manual push button switch to bypass the resistor and feed a full 12 volts to the coil when you run the starter motor.
If you have a ballast resistor on this tractor in the coil circuit, you probably have a problem in that circuit. The most likely failure would be the switch in your starter switch. If you have a volt meter, you could check the voltage at the coil when you start the engine. With the key in the on position, the voltage should be around 7 volts. In the start position, it should pull it up to 12 volts. If it doesn't, get check the voltage change right off the starter switch. If it doesn't boost it up there, that's your problem.
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