1996 Chevy Blazer altinator

Ok I think I might try and replace the belt and if that dont stop then I will go out and buy a new alt. And I have a few more questions to ask. On my blazer my rear wiper on my truck just stoped working the moter is still working but when I turn it on it dose not like to move the wiper blade it seems to be stuck but when I turn it on and go move it it will work could that mean I need a new belt for that or a whole new motor

Ok I will try that when I get back home and see if that stops the problem and that the blade will work lik I said it will move when I go and tap it when its on so im thinking it could just be that cap and how much do you think a new coolent line would cost if I would bring the truck in I have a few things wrong with the car distrubitor cap is bad and the gas gauge dont work replaced the pump and when I did that I filled it up and it went to full and never came down it will move at times when car is off but when its on gose rite back to full