ok, but the fan works when I remove the cts harness. If the relay was bad wouldnt it not turn on at all? o2 might be an issue, but check engine is cts because I have to remove the harness to get the fan to work. It will not turn on without me disconecting the plug so that leads me to believe that the harness is bad. The cts is new. As for the wiring question do you have any idea?