Some background info:
So I have an 05 s2000. I've owned it for a year. I bought it just like it is. It has a full exhaust. Also, I have amp/sub setup. I've had no issues with it until now. My alternator fuse keeps getting blown. I've changed the battery. I've changed the alternator. I've changed the fuse. It will run well for 2-3 weeks. Then, my dash lights start to dim, headlights turn off, and eventually car dies. I'll change the fuse and it'll run again for a few weeks and die again. It's been really getting on my nerves. I've tried disconnecting the amp/sub from the battery; that hasn't helped. I've checked for bare wire; I couldn't find any bare wires. Idk what to do at this point. I want to find the source of this problem. Guys please help!! Any tips/suggestions are appreciated! Thanks

 

Check the ground wire and heavy wires from battery to alternator. Good, clean, tight contact.

You may have a parasitic draw on the battery. Run test:

https://www.youtube.com/watch?v=KF1gijj03_0

http://www.youtube.com/watch?v=KF1gijj03_0