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FIRST thing you need to try is clean the terminals.
If that doesn't work, you need to invest in a multimeter--something that is very cheap in this day and age. Just about any parts store, Sears, or Radio sh## sells them. You also should buy a so called 12V test lamp, sold at any good parts store.
Clean the terminals, and if that doesn't work, get the meter and lamp. I can help step you through some of the troubleshooting.
(thought: since this car is getting old, one thing else you might want to try, is pull apart the "firewall connector" and AT LEAST wiggle it "in and out" several times to "wipe" the blades)
These old cars are pretty simple. I still have my '70 shop manual, which is still similar. Only real difference between my old manual and your '73 is that yours came with electronic igniton, mine was breaker points.
Learning the basics of electrics troubleshooting is something that will do you good the rest of your life
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