Ok the speakers went dead issue is partly solved. Think my amp has some problems and it was sent for repair already.
BUT
on the car going dead issue. It's still around. Some times, the electricals flicker a bit and came back alive. Just now as an experiment, I flash a couple of times, and the car seem to be drained of power. Everything went dead and flicker about. With the flash pro-longed, the engine went dead.
I had to give the battery terminals a knock to be able to restart back the car. After restarting, I did the flash trick again and there's no difference.
Damn what the f- - k is wrong with my car???