" *** Before reconnecting your battery, put your key in the slot and turn your lights to the on position. This way you dont send all of the new electric current to your computer and fry it. I know that its only a small, small probability, but it is a precaution to almost guarantee it wont happen. New computers for your car can cost up to $2500, so please do this step... "
I don't quite get the above instruction.. Is it really necessary?
what light? the headlight? clarification needed.