You got the idea, but it is not correct. You can touch anything with a disconnected positive cable, even the negative side of the battery. The real safety issue is that, if you are disconnecting the positive side first, and you touch any metal part of your vehicle "with your tool" while loosening the cable, you may cause sparks that may in turn cause your battery to explode if it is low in charge or in bad shape. Other than that, you can touch anything with either "disconnected" cable.......For safety, the negative cable is the one to disconnect. If it accidentally contacts something, the results will be much less severe than if a loose positive cable contacts something.....
Just remove one of the battery cable and with that cable touch the other cable a couple of times, you don't need to wait.Same issue here.
The radio doesn´t turn on after a battery change, but the cell phone was displaying that it was connected to the bluetooth (Uconnect), which give me some hope.
I brought the car to an Car Audio Shop, the guy unassembled the dashboard, removed the radio and the cable in the back of the radio. Waited for 20 minutes and put everything back in place.
This didn´t work!
I´ll try removing the battery and let you know the results.