If this has been asked before, please let me know where the thread is. I've tried searching for the past three days. Here it goes. I recently did a big 3 wire upgrade (Alternator, bat to block ground, block to chassis ground, 0awg) on my 07 Expy. I noticed that all the power wires were in terrible condition, not just the alt to bat wire. I was able to identify 2 of the 3 wires and get those replaced. 1st replaced wire: 0awg from the alternator to battery 2nd replaced wire: 4awg from starter to battery 3rd wire:?? I have no clue but it looks like 6awg I really want to replace the 3rd wire as it is corroding from the inside. This wire is also extremely short and wired like a cable, not fine strands like normal power wire. I thought it might be the starter wire because of the corrosion mentioned in other threads, however, the starter wire was pretty bad too but that wire is new and ready to roll. Any help would be greatly appreciated. If needed, I can post some pictures. Thank you for your time.