Ok so my chevy 1500 1999 extended cab 4x4 is having an on going problem with over charging then draining the battery and cooking the positive cable wires we have replaced the alternater, even though it tested twice passing and two batteries, pos. cable, relays only to find we still have the same problem going on I want to know if the pully size of the three pullys on my engine might have been exchanged and might be the wrong size now i need a proper size for all three of them or a picture to find out or if it could be a plug that sends the currents through???? I am at a loss and have spent alot of money with shops and parts only to find out that they really don t know whats going on.