Hey, i tried making my oen phobe charger by connecting a 12v cab equipment plog to a 12v-5V car phone charger. I plugged it in and turned pn the switch, and i heard a beeping and took the thing out and pressed the switch back off. Now the alarm beeps weak for everything (low fuel level alarm, 3pt errors, gearbox errors.) does anyone have s clue on what is going on and how i can fix it? The cab utility 12v plug aslo does not get power, but the rocker switch sends to it.