ALTERNATOR NOT CHARGING

I Was Driving Home One Day, And The Head Unit Stopped Working Shortly After The Digital Dash Started Acting Up. I Figured The Alternator...

My Truck Seems To Have An Alternator Problem. When Hot, The Voltage Will Drop To 12.5 Sometimes And Stay There, Then For No Reason, Jump...

My Battery Not Charging Light Came On The Other Day. Had The Truck Taken Into A Shop Where They Tested The Battery And Alternator Putting...

When Cold, My Alternator Charges Around 14.5 To 14.9 Volts. When Everything Warms Up, It Drops To About 13 Volts. Is This Normal...