I need to know if the battery on my car is negative or positive grounded.

It is a neg ground.... but it doesn't matter.... ALWAYS hook red to pos and black to neg!!!!! ALWAYS!!!! Batrery charger... jumper cables etc...

Find the negative terminal on your car battery and if it is attached to body of vehicle then it is negative ground. The battery should have a - for negative on the negative post(usually a black cable going to it) & a + for positive on the positive post(usually a red cable).