George & Paul, I appreciate your attempts to help. I am aware of the importance of noting the position of connections etc but unfortunately they aren't visible until the unit is clear of the door casing. It may be that it wasn't originally connected, as not needed, on this particular model. I had already searched, unsuccessfully, for a wiring diagram before posting the question. I certainly wont be trying the 'suck it & see approach which I'd like to think was 'tongue in cheek'. I just thought there might be a pro repairer with experience of this make/model but thanks anyway. CP
Cliff, January 2012