all of my lights work but the rear running lights wont come on.

Do your brake light,s work?

yes

I can only say this then,if your front running light,s work,there has to be a short in a wire going to back where lights are,or maybe check the socket,s where you put new bulb,s may be coreded or bad.

the sockets looked fine so how do i fix i short

a

First you need a test light.Use it to test where you put the new bulbs at,then if you don,t have fire,you have to follow wire harness all the way to find short.

Thanks

Would replacing the center break lights help with this issue?