A big hello to everyone as this is only my 2nd post!..Ive been putting an 03 172 back together and now it starts but its sounds terrible and when driven the ecu light flashes...As all was well before the tlc it must be something saft...the only thing ive noticed is a three pin plug with the 2 fan plugs that's not connected to anything?? and for some reason the lights seem to be making a funny noise when ignition is turned on? Any help on these issues would be really appreciated.