Here was my issue: I am about to work on a sound system for the Suburban. One part of the system is an amp that needs a 4g power lead wire, directly from the battery to the amp. The problem was that the battery already had two rather thick wires to it already; an additional one would have crowded the area. Not to mention the fact that I was wondering what kind of draw was already coming off this one battery! So... I decided to put in a second battery. The suburban was designed for a second battery so this should be (and was) a piece of cake! Here now, I present you with what had to be done to install a second battery. I hope this write-up serves someone else well in the future. As usual I make it known that I NOT an expert and anything written here is meant as a guide only. Please do your own homework - I can't be held responsible for anything you do to your equipment. If you end up blowing up your truck/car, catching the garage on fire that lights your house ablaze and you happen to lose your beloved chihuahua in the ordeal well, that's your tough luck! Far (passenger) side is the current battery. You can see on the driver's side (forefront) the battery tray for a second battery. After checking sticker codes I determined that I had the 140amp alternator which is the alternator installed for two-battery setups. Perfect!