95 stealth battery not charging
 

Hi, my battery died few weeks ago and had it replaced, also noticed 2 weeks before it died 3 lights brake,battery and coolant was illuminating on the panel.
Again new battery, I checked and cleaned battery post, checked ALT fuse and ALT relay all seems fine. My next move is to replace alternator but before doing so I want some input from you experts, can my ECU be bad causing all 3 lights to illuminate, can it make my alternator not charge my battery....need your expertise ... please

Anybody ???