... and it helped! 13.7v to 14.2v (car running @ idle)
Well, I've decided to go ahead w/ the Big 3 install. I don't have a monster system (Alpine M450 and F250), but my headlights (and interior lights) would dim on bass hits. IIRC, my stock alternator puts out 105 amps, which isn't bad, so I don't see a reason to upgrade that. I suppose I could put in a better battery, but decided to see where the Big 3 got me first.
I decided to start w/ the Battery (-) to chassis step first, since it is the easiest. I decided to use 4ga. because of my small system. I picked up some terminal *protectors* (the green and red pads you put around your posts), some Tsunami battery terminals and some battery post/cable protectant spray. I got the spray and terminal protectors because I had quite a bit of oxidation and wanted to see if this stuff helped.
I used stinger 4ga. The stock looked like 8 or 10ga. I took the battery out of the car, cleaned it up (wiped off all oxidation residue and used a post cleaner/scraper on the posts). Then, I installed the battery terminals. I snipped off the old stock wire going from bat(-) to chassis. I replaced it w/ the 4 ga. and a gold-plated ring terminal at the chassis (same hole). There is another wire going to that same spot... I'm unsure where it is going... maybe the alt? Maybe the engine/******?
Put the battery back in and connected all the wires (stock 8ga(+), stock 4ga(+), amp 4ga (+) and new 4ga(-) ground to chassis. I sprayed the terminals and the grounding point w/ the protectant spray, which gives the stuff a cool red gloss... kinda neat. I will have to wipe it all off next time I mess w/ the stuff, but I don't think that will be a big deal.
Before the install, I tested the battery w/ the car running @ idle... it tested 13.6-13.8v. After installing the 4ga(-) wire, I tested it again @ idle... tested 14.1-14.3v. It seems this simple addition has helped already, unless somehow having everything disconnected for 30min. affected something. I'll test again later after driving around and see what I get.
So, I'm impressed. Next are the other 2 (more daunting) steps. I don't even know how I'm gonna get to my alternator. This is gonna be fun.