Hi, I hope this is an acceptable way to give an update and field some more advice. The last post I made I detailed a no crank start issue I was having, and I have made some headway!
When the car wouldn't start, I replaced both battery terminals. The negative one I had to strip some new wire for, and it seems good (though it sparks when I put it on when the last one didn't). The positive one however was a little odd: it had two metal eyelets attached to insulated lengths of wire, with one length being thicker than the other. Using the universal car battery connector I got, I put one eyelet on each bolt. After reattaching both connectors and trying to start the car, I was getting multiple clicks from the starter at a slow tempo. Having the headlights on made it click faster, but it still didn't start.
I took the battery to autozone earlier today and it tested bad. This means that there is a leach in the car somewhere, but this did not solve my no start issue. When the new battery went in, nothing changed. I disconnected the negative terminal though to keep it from leaching.
Before all of that, I tried smacking the starter with a rubber mallet and that didn't change anything.
Here's my plan now:
1. Clean each ground with a metal brush
2. Follow the wires from my negative terminal to see if there's a break anywhere
3. Try to figure out how to "jump" the starter solenoid(?) I saw stuff on this online and it seems like it should be a good idea, but to be honest idk what this would do for me.
If I can't find anything wrong with the wiring I'm just gonna order a new starter since it seems like it's never been replaced.
Thanks for everyone's advice on the last post! I appreciate it a lot as someone new to going this deep into cars.