The negative battery cable is black and the positive battery cable is red.
The positive battery cable will lead to the starter while the negative battery cable will connect to the body of the car which is negatively grounded.
Always remove the neg. battery cable first, and then the pos. battery cable second. And install in the opposite direction, pos. battery cable first, and then finally the neg. battery cable to the battery.
Also, many batteries have the (+) and (-) posts labeled in an embossed fashion on the plastic case.
Do not reverse, or else the vehicle's electronics can be fried.
Good luck on this repair.
SOURCE: Battery Posts
If you're talking about the posts on the battery itself, I'm pretty sure your only option is to get a new battery. You could try using some material to complete the connection, but I would have to reccomend against that in the strongest language possible.
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