this is a 94 prelude SI. both of the back up light not working.. I check the fuse it good. and than i check the switch on the tranny working good also. so than. i feel + power by using a power probe. it works. the proble m i found out is on the back up switch. the power wire which is the yellow wire it showing ground power. Is it suppose show + power? Can any of expert tell me what's wrong with it. I will very ppreciate ur help!!!