Hi , today i was trying to help someone needs a jumper cable from my car so i hooked the car battery correctly and gave him the other side of the cable to connect it with his dead battery i thought he knew what he was doing unfortunately he hooked the cable backward , so now the batteries connected in series + to - , my car stopped immediately (it was running before this procedure) then i removed the cable tried to start my car again the car started fine i checked everything (radio, AC, power windows … Etc) all are working fine , i tested the alternator found it charging as normal also measured the battery and it seems fine , so what could possibly happen to shutdown the car suddenly by itself !!! Anybody has experience with that kind of situations ??
My car is : 2010 Mazda 3