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 - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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