Hi everyone, About 6,000 miles ago (many years though) the alternator on my 6A12 MIVEC swapped Mitsubishi Mirage started failing. Unsure on history of the original alternator. It was replaced with an aftermarket alternator which lasted 6,000 miles. It started throwing an error code for FR terminal however was still usable and charging. It also drained the battery but the car is rarely used so I would just disconnect the battery when not in use. I replaced it with a second hand genuine alternator (23 years old to be fair) and the same error code was appearing (FR terminal). At this stage I swapped in a spare ECU I had for the car, same issue. I then had the genuine alternator rebuilt. Upon installation it worked great. No errors codes, charging fine. But it only lasted about a half hour and it stopped charging completely (not just an error code like previous alternators). Is it possible something is damaging the alternator? How would I test something like this?