Wiring issues...
 

I have a s13 with the ka24de, the harness was chopped and needed replaced. So I replaced it but the new one won't plug back into the body harness. I did notice that the male plug on the engine harness is brown, and the female plug on the body harness is white. Is there an adapter that I could get to fix this problem?

Are you referring to the dash plug? Is your new harness brand new, or is it used? And what year is your car? If it didn't come with a DOHC from the factory you'll have to swap the dash plugs. All the wires should be the same color.
http://www.frsport.com/SR20DET-Swap-...SR20_t_26.html

There is no adapter available.

You need the male plug that is the same color as the female counter part.