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Battery power goes directly to the starter.
The solenoid is energized by power from the ignition switch, routed through the relay plate.
It's possible someone relayed that circuit for you using non-stock parts (common mod).
Here is your wiring diagrams.
B is the starter.
T connector is yellow wires on the engine compartment reply plate.
D is the ignition switch.
This is for the '74. Note some cars have a seatbelt interlock switch in that yellow circuit.
If someone has added a starter relay then it'll likely be in teh yellow wire in between the relay plate and the starter solenoid.
You can test your starter by getting underneath, driving wheels off the ground and out of gear, and using a screwdriver to short the battery terminal to the terminal that the yellow wire goes to.
Be safe. Don't kill yourself.
The silver "relay" with the yellow tape is your voltage regulator. So, no.
Test light or VOM, see if you're getting voltage to the yellow wire at the starter when someone turns the key to the "start" position.
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