If there is no obvious indication of lights remaining on after shutting the truck off then having the battery checked at your friendly auto parts store may be in order. Even a new battery can fail. Check the terminals especially if the engine has a poor crank. The voltage should not go below nine during crank at the battery. If the voltage is above 11 and the motor will not crank look for a bad connection.
If the truck is running no lights or heater off the voltage should above 13.
Monitor the voltage for a day or two and see if the voltage drops. Much below 11.5 would indicate that the battery is discharging. With out special equipment it is hard to see the drain from the battery by the truck.. The Electronic modules are always drawing some low level current from the battery.
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