trouble with taillights

I just have a question.. my boy has a 99 cav and aftermarket taillights that the right taillight always burns out. He will change the bulb and within 10 mins it is burnt out anybody got any ideas on why? If it is the ground wire or what?

bad ground, short, wrong blubs, there are a bunch of differnt things and you just have to elliminate them one at a time. Electrical problems are a pain because there is no one problem.

^..... and the new after market tail lights wouldn't cause the bulbs to burn out.. there just housing for the bulbs.... but i hope they don't leak on him.

thanks guys :)

and i know the actaul tail lights dont have anything to do with it