can anyone help . all at the sametime i started my car noticed the brake light was on. the battery light was on. and heater and blower wasent working.all happened at the sametime. all was fine before the last start up

Classic sign of a failing alternator.

These trucks are designed to turn off, or make accessories run weird when voltage is low. They are also voltage happy vehicles, if they sense a weakness anywhere they can make it miserable for you.

Your alternator's voltage may register fine, but when under a low it's crapping out, I can almost guarante this is your problem.

When my alternator went, A/C, the radio, even my dash lights and the transmission were all acting funny. It got to where my radio wouldn't even turn on.

I highly recommend an OEM or Bosch replacement, do NOT just use any aftermarket alternator, these trucks have been known to eat them in short time.