Yesterday I tried to connect my ELM 327 bluetooth works great with Torque for android, and then wanting to test and connect it with the PC with various programs type scantool etc., I connected the battery charger to 12v at the battery with the engine off, and I noticed that with the ignition switched off, the battery charger takes between 0 and 6 amp alternatively, the cio? type 2-3 seconds to 0, and 2-3 seconds on the 6 and cos? via. Not ? not that I skip something by connecting it even why? I would then like to do a reading of it in the obd when I will arrive? the mpps cable and I don't want to jump the battery or worse yet, to the control unit. The machine ? a Audi A4 2.0 TDI, 2005, and the charger I got at the supermarket