Why does my battery read -12 when it should read +?

My battery is reading -12 all of a sudden when I check it I took cables off and still -12 what could be wrong or:My battery is reading -12 all of a su

My battery is reading -12 all of a sudden when I check it I took cables off and still -12 what could be wrong

or:My battery is reading -12 all of a sudden when I check it I took cables off and still -12 what could be wrong

or:Your voltmeter has a + and a - terminal. The + is red and the - is black. If you hook it backwards it will read - instead of +. Either that or your battery is reversed from what you think it is.

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