Black & Decker Power Inverter PI400AB "makes beeping sound" Questions

beeping when i plug up my laptop If your not getting enough voltage to the inverter it will beep to let you know you don't have enough power. Most common cause is a lose connection thru your cigarette

...makes a loud beeping sound and displays LUP check the wires you either have a bad connection or a bad wire the power in verter has 4 wires 2 neg 2 pos if 1 of the 4 is loose or bad it will give lup ...