No energy is "jumping the open switch gap". Power to coil to keep engine running after ign key is turned off comes from the alternator, not the battery, if you don't have the diode. Diode is analogous to a plumbing check valve that only lets water flow one way, only here we are speaking of current only one way. Yes direction is important....diode case will have a line/band of paint around one end....that end goes toward the alternator. Ford didn't use fuse, but others did....suit yourself on that. Google amp, Google volt. Older vehicles used ammeter to show battery charge (+) or discharge (-) and newer ones tend toward simple idiot lights or voltmeters to indicate 12v or less and 13 to 14 volts fully charged/charging. Again, your choice. Some remove ammeter & plug voltmeter in its place (obviously a wiring difference). I use a hand held voltmeter when I have a problem & am troubleshooting.
The diode is easy/simple/no mounting/etc. whenever going to alternator from generator where the original did not already have an idiot light. If it already had idiot light as do some later tractors, then simply use it or on yours add one if you like....again , your choice. Idiot light is placed in the circuit in the same place as diode. Light bulb instead of diode. GM actually used a resistor (10 Ohms/6.25Watts) in parallel with the light bulb, if you want the excite to be exactly as GM did it.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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