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look here https://www.google.com/search?safe=off&q=v6+4.3+vortec+engine&bav=on.2,or.r_cp.r_qf.&bvm=bv.51773540,d.b2I,pv.xjs.s.en_US.GZikMza0zSU.O&biw=1152&bih=745&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N
unhook battery -take tension of belt- unhook wires from alternator-take out any bolts connected & brackets connected-install in reversed pattern. if you forget how things go take pics.- video-draw diagrams ,whatever works best for you.
I don't have the wiring diagram, but here is how it is wired, the large red lead bolts to the insulated stud on the back of the alternator, the other 2 smaller wires are to the "D" connector, go to a good parts store like NAPA or CAR QUEST and ask for a repair connector for your alternator, it will be a stub connector with 2 wires in it, just splice it to the old wires and plug it in, one wire is bigger than the other so it's hard to screw that up. Any further questions just post a new message. Go to it and lets drive!