My ammeter doesn't work on my Duster for whatever reason. I unbolted it and spliced them together with a 30a fuse. Is the fuse needed? I don't know but that's what I did.
Depending on how big the alternator is, and how much load is on the system, 30A "may not last"
That in short is exactly what is wrong with the OEM design. The wiring is not large enough, the bulkhead terminals were never designed to handle that kind of power. So you can't protect the wire by "conventional" fuse sizing, "it just won't work"
