Fleetwood Heritage

petrotheboxer

Just got a 2003 Fleetwood Heritage 640ES van, which seems very good.  Hope someone might help with this though:  as you look at the sink, on the left are 3 'switches', bottom normal mains plug; middle TV/12v but the one above a fused switch I cannot work
out.  It is fed from the mains but the other lead (mains), which has been disconnected, travels up into the roof and from there on I cannot work it out?  The van has no air conditioner but should this be a unused supply for that?  Any advice would be appreciated.

Mike