MotoMetalT100

I Just bought a 1997 3.4L 5spd 4wd T100. It is obvious that the truck has been off-road a number of times. For some reason the battery will NOT charge. I have replaced the alternator TWICE and replaced the battery leads. When tested at the alternator, my meter will read 11.9v to 12.2v, the same as the dying battery. I have a suspicion that it could be the PCM because the truck also "clicks" a few times on startup as if the starter is going bad, and idles at 2000 RPM. Im not sure if its related, but also the temp guage and oil pressure guages are INOP. As well, the blower motor is INOP. When I got the truck all the front lights were blown and broken (got swamped?) I noticed the PCM/ECU is in the passenger kick panel and can easily get wet. Before I buy one can anyone confirm that I'm on the right track, or tell me something else to check first? IM PULLING MY HAIR OUT!! MASTER TOYOTA TECH'S PLEASE HAVE MERCY ON ME!!!!