Re: ford 1953 jubilee tractor will not start

Posted by used red MN on February 17, 2023 at 19:28:52 from (68.46.31.28):

In Reply to: Re: ford 1953 jubilee tractor will not start posted by Geo-TH,In on February 17, 2023 at 15:11:24:

Woody if you read through to the end of this reply there is some info for you.
George, this will be my last rebuttal as to not clutter up the purpose of this thread. I left it out but I intended to only imply that ..step up.. circuit may not be required. He has already proved it is not necessarily needed because the tractor already ran once in its current configuration. Is it an option to add later certainly. As far as ..All cars, when I was a kid, the ballast resistor was bypassed using the ignition switch.. A bit before that not sure of the exact time per your age most all vehicles were 6 volt with 6 volt coils and ..surprise.. they started. So the resistor makes the coil think it is in a 6 volt vehicle so surprise it should start and run. I realize that his coil and resistor measured resistance may not exactly be electrically ..on par.. but close enough for this example. Lastly diodes and their function may be ..old hat.. for you but for this guy it is ..likely.. that he is not quite that in the know.
For Woody here goes.. a diode is essentially an electrical one way valve when comparing electrical theory to water flow. Once the power for the coil passes through the ballast resistor it is theoretically reduced to 6 volts. The circuit George is suggesting takes power from the stud on the starter and connects through the diode to the positive side of the coil providing full battery voltage while the starter is cranking the engine. Once the engine starts the power to the starter drops off when the solenoid is de-energized. The coil is now powered by the ignition fed through the resistor. If this circuit was a solid wire the coil circuit would be trying to turn the starter. The coil circuit and in particular the resistor is not a heavy enough circuit to operate the starter motor which you would not want it to do anyway when the engine is running. To eliminate this the diode is installed in the circuit. The cathode side of the diode connects to the positive side of the coil, the one way attribute of the diode does not allow power to flow back to the starter so the problem is solved. However the diode does allow current to flow towards the coil while the starter motor is energized. Hopefully this explanation is adequate.

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