Thanks for the replies,
It does have an aftermarket sound system, just a deck though, the rest looks like stock Mach audio components. Looks professionally installed, it has the Metra harness and everything else done right from what I've been reading about it. I replaced the Sony Xplode deck with a JVC deck a month or so ago, but it was a simple plug swap, same general specs on the deck as far as voltage, OHMS and all that so I don't think the load changed much. Checked all the wiring that I changed and everything is clean and not grounding out on anything.
The idle might have always been that way then, and maybe I'm more sensitive to things that don't seem right since it died on me a week ago. (This lead me to the negative cable being swapped, the alternator just quit charging randomly but has since worked fine with the new ground)
As far as cables and wires, I replaced the negative battery cable, it was pretty corroded and had the thin lug on the battery end, so I used a heavier duty terminal. Did resistance readings on several spots and didn't get over .2ohms on anything. The positive cable is clean, no corrosion or anything as far as I can trace it. I have no idea how old the battery is, the date was never scratched off, and the alternator was replaced by a shop in 2011 according the maint. records I got with it. I'm suspecting the battery might be nearing the end of its service life, or possibly an intermittent alternator issue. I hate to just throw parts at it, but a battery might not be a bad investment?
Last edited by Adam1389; 05-15-2013 at 12:20 PM.
Reason: Added info.