AitchJ

Many thanks to RAF96 for your post - you are correct in saying that I had the plug reversed. I didn't dare trying to reverse it as I feared I may wreck the decoder but it seems not to be the case, as it explains in the link that you provided. I have now managed to get my NCE Power to accept the decoder and all will hopefully be OK. My only defence for being naive is that the diagram in the Hornby Instruction leaflet bears no resemblance to what you actually get and it also points out that PIN 1 marked with the white dot should match with a symbol on the socket - but the only symbol on the socket is on the side adjacent to the blank pins. DCC ready it says on the box - more like not quite ready methinks. In between times I contacted the retailer of the loco (must be a decoder issue says they), contacted the retailer of the decoder (contact Hornby says they) looked at Hornby website (cannot provide assistance for items not purchased from their website and thus refer to the retailer says they). So thank you for putting me right - I am very grateful.

Never fitted a DCC decoder before so bought 2 DCC Ready Hornby Peckett's to make a start on going DCC. One 0-4-0 version with Hornby 4 Pin Decoder that was as described in the instructions and worked fine with NCE Power Pro. Then tried to fit a Hornby R7150 decoder into an 0-6-0 Peckett and find that the loco instruction diagram bears no resemblance to the reality. What I have is, as I believe has been posted before, a socket with four connected wires and two bare pins. I can connect the decoder but am I missing something here - it leaves me with the orange and grey wires on the decoder harness plugged in to the two bare pins on the socket. I assume this can't be right - any help as to what happens next would be much appreciated