Quoted from your intro thread
Originally Posted by BillBoost37
Nothing really with a charging system problem that I'm aware of...more of a when the car runs oddly or badly and you can't figure it out.. swap out the pcm. Usually that fixes things up. Many here with your year have a spare pcm they picked up at a great deal from a JY etc for that just in case situation.
Replacing the pcm is quick and easy. I'd still like to know what you are talking about saying it'* a charging system issue that is pcm related. Your alternator and battery can be tested independently to rule them out.
Upgrading the wiring like you are aiming for a large stereo is not necessarily the answer if the car is stock.