My v6 2001 jeep grand Cherokee llaredowont start, nothing comes on, no dash lights no dash instruments nothing why is this happing?

New battery, new battery cables, new fuse both fuses boxs, new alternator, new starter, new fuel pump, new cam shaft position sensor.

Straight 6 4.0L or V8 4.7L engine? You mentioned V6 and no such engine for that model exists. I can send you some wiring diagrams if you need them and give you further direction on what to test if you want.

Its a straight 6 4.0l rear wheel 2 wheel drive