new battery, new alt., new pmc(comp.) and battery still goes dead, any idea??

First, have your battery tested to see if it has the ability to hold a charge and a load. Even if "new", it doesn't eliminate the chance it is faulty. Then, have you checked for power output from your charging system? Again, "new alternator" does not necessarily remove this as a possible cause. Last, have you checked for a parasitic draw on your electrical system after the vehicle is off? If your battery is being drained by a component that is not shutting off, this will cause you problems. Hands on testing in that order will get you to the bottom of your problem.