How do you know one is loose? There are quite a few grounding points and jumpers around the vehicle, so a description of the problem is needed.
In any case, you should check the battery cables, check and clean the battery connections, and check the primary grounds. There should be two cables attached to the negative (black) battery post - the large one connects to the engine, and the smaller one to the vehicle chassis. Follow both wires and check the connections (remove the bolts, thoroughly clean the bolts, lugs and mounting points and reconnect).
What makes you think you have a loose ground wire, or how did you arrive at that conclusion?
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