I have reason to believe that my power window relay has gone bad. Using a test light, I'm getting power on the wire from the fuse box, but not on any of the three other terminals (red, black, or white/tan). The single terminal comes from the fuse box and the other three goes to the passenger's side window switch, I believe. I've called and searched and no one seems to have one. Is there any way to repair a relay or any other relays that can be substituted?