2005 Chevrolet Tahoe .....not getting any power at all

the battery needs to be fewer than five years old the date of the first charge will be noted on "push off" labels of the battery...buy a new one, the other end of the black cable (non-clamping side of your 1/0 battery cable) will need to be cleaned...the chassis/frame will need some electrical contact area...use a wirebrush and re-assemble it. The positive Cable goes to the starter solenoid, be sure this one is clean and making electrical contact too~...to re-iterate: New battery, Clean Ground Cable, Clean Red Cable and associated connectors~