Hi,
Does the starter engage, and the engine not start? Also, a loose battery terminal can cause a weak connection and prevent the starter from engaging. The voltage is also a little low and the starter should have a trigger wire. It should be the smaller gauge white wire with a pink tracer.
I attached the wiring schematic below for you to review. Take a look through it and confirm the fuses are good, the starter relay is good, and there is a trigger wire on the starter motor.
Here are two links you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Let me know exactly what is happening and what has been done so far. Based on the issues you mentioned, I'm not sure where I need to start.
Take care and let me know as much as you can.
Joe
See pic below.
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Wednesday, May 18th, 2022 AT 9:25 PM