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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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