Does anybody know where I might locate the 12v cable and relay that powers the fridge when the engine is running on a 2007 Lunar Roadstar 800, which is based on a Fiat x250 3lt. The fridge doesn't work on 12v, the fold out step doesn't retract when ignition is on and the 12v electrics still work with the engine running, reading the instructions for the sargent EC200 PSU2007 the electrics shouldn't work and a message should be displayed on the control unit stating that the engine is running, this is not happening so I'm thinking that these may all be connected. There is a wire coming from the 12v connection on the fridge that would appear to also run to the step, but the 12v wiring to the fridge appears to come from the PSU I've looked under the bonnet for a relay but can't see anything obvious, any advice or views would be appreciated.