Weird mustang issues - won't start
I don't even know where to start in trying to fix my poor car. So any help would be a god send!
I have a 2000 manual v6 mustang.
1. Occasionally when you try to start it, accessories will turn on, then when you go to turn it over, there is a loud click then nothing. If you try to turn it on again, there are no accessories and no click.
2. If you let it sit with the battery attached, after about 15/20 min you can get accessories back and get that single click again.
3. If you detach the battery and let it sit, you can usually reattach the battery after 15 min and it'll start. If it doesn't and you take the battery out to be charged at Auto zone, they will judge you cause it's already at 70/80% but if you get it back up to 100% then it will definitely start.
4. There is definitely stuff drawing power and I did a fuse test thingy. It's the Alternator, radio, and instrument cluster/pcm are the big ones, and the secondary air intake is drawing a little bit but I don't think that's anything.
Previously I have replaced the starter (actually twice this year) and the alternator and the fuse box.
I realize the pcm is probably the thing that's doing something funky here but I'm not sure what to look for or how to fix it. I'm not seeing anything grounding out.
If you have absolutely any suggestions I'll try it.