Electrical troubles

(alternator and battery changed in November)
So recently iv been having the battery light flashing on my Evo and it usually happens after it rains but goes away after a day or so.. but the last time it happened it hasnt gone away the car stats and reads around 14 V but slowly drops to 11ish then all sorts of lights and codes start to pop up.(ASC SYSTEM/4WD SYSTEM/AIR BAGS) and a p0622 code at first i thought it was the fusible link because my old one was melting but after replacing that its the same issue.. Also while changing the fusible link i noticed the wire running from the link to the alternator(pics below) is kind of corroded im curious if anyone has any advice before i take it to the shop on monday and pay $400 for a diagnosis thank you!