Subharness wire for 240

Basically what happen with my car is the terminal fuse that connect to the positive terminal on my battery keep coming loose. when that happen my car have no electricity(no power). I went to the dealer and ask them for the fuse, the dealer said they don't sell those seperate and that the fuse are part of the positive battery wire which they call the subharness. If I want it I would've to paid $100 for it. So i'm going to the junk yard to see if i could get a working one for cheap.


Anyone know what's include in the subharness wire for a 1990 240SX. I need to get a new one from the junkyard, and I need to know what it's so I can take the whole thing.