bumlove_blue
+1y
Your alternator provides power for everything in your truck when running. The battery is there for peak power draw times and is mainly used for starting. You may have cooked the alternator by running it with out the battery connected to it. So an easy test is turn on everything heater high beamns etc and then check the voltage at the battery, if it can't keep up then you need a bigger alternator, also CHECK YOUR GROUNDS! to the engine and battery etc, no rust or corrosion should be present.
Hope this helps