Just got this unit and I'm testing with a 12v battery charger. Right now it is very glitchy..especially when I change modes (Radio, Aux, Bluetooth etc). It would beep and screen would black out momentarily every 2-3 seconds..and it cycles like this until i disconnect the wire and start over. The way I connected it to the 12v charger is black wire to ground and red/yellow to positive. Aren't these the only minimum wires required connected to do a bench test?
I'm wondering if I have a faulty unit or I actually need to connect all the wires to the car for it to function properly.