MikeBr95 Posted May 22, 2019 Share Posted May 22, 2019 I have just bought the R7150 decoder to fit into the Terrier however I have a wiring problem.I fitted the decoder and tried to program it but all attempts failed. I then got a multimeter to check if I had the plug correcly inserted and to my suprise the wired pins on the Terrier did not match the decoder pins. The Terrier pin1 was from the left but should have been pin4. Pin 2 was from the right rail but should have been pin3. The result is that the order of the 4 pins is reversed on the Terrier compared to the decoder. Is this normal or have I got a faulty Terrier? ☹️ Link to comment Share on other sites More sharing options...
Ruffnut Thorston Posted May 22, 2019 Share Posted May 22, 2019 I have fitted the same decoder, but have not tried it on DCC yet. The loco runs ok with the decoder fitted on DC though. The plug on the decoder can be fitted either way up, so is it the right way around? /media/tinymce_upload/c4b9cc7d65728ca316f5795375c2bca7.jpg/media/tinymce_upload/c208eb2700eb67fb5ea45462ae48fd51.jpg/media/tinymce_upload/3eb87004a71767526717d04975a2813b.jpg Link to comment Share on other sites More sharing options...
Chrissaf Posted May 22, 2019 Share Posted May 22, 2019 No it is not normal as the 6 pin wiring is a NMRA standard and should be adhered to by manufacturers..The problem is that wiring errors on Hornby locos is a far too commonly reported issue. You may be unlucky and your loco miss-wiring is just a 'one off' error. But be prepared for a 'replacement' to have the same wiring fault if it is from the same manufacturer batch..Just by way of confirmation, the drawing below (courtesy of Brian Lambert's site) shows the NMRA 6 pin wiring standard../media/tinymce_upload/e14899a50005479c7a39aefaec955959.jpg.Your post indicates that the wheel pickups are appearing on pins 1&2 of the socket (should be 3&4) and that your motor wires are appearing on 3&4 of the socket (should be 1& 2). If this understanding of your post is correct, then this can't be corrected by reversing the decoder plug as that would put the motor output of the decoder on the directional lighting wires..TIP: As this is your very first post, just be aware that the 'Blue Button with the White Arrow' is not a 'Reply to this post' button. If you want to reply to any of the posts, scroll down and write your reply in the reply text box at the bottom of the page and click the Green 'Reply' button..Particularly as my reply includes an image. If you use the blue button, any reply you write, may be held back for image approval. Even though it is already a previously published image. Link to comment Share on other sites More sharing options...
96RAF Posted May 23, 2019 Share Posted May 23, 2019 Pin 1 beng indicated clearly by the triangle and the number 1. Link to comment Share on other sites More sharing options...
96RAF Posted May 23, 2019 Share Posted May 23, 2019 Hornby R&D says they have rung out their sample and the wiring accords with NMRA 6-pin requirements, so I suggest you send yours back to the seller as ‘broken’, explaining why and asking them to ensure the replacement is correctly wired. Link to comment Share on other sites More sharing options...
MikeBr95 Posted May 23, 2019 Author Share Posted May 23, 2019 Thanks for all the replies. I will talk to my supplier tomorrow about a replacement, once I have re-assembled it.Thanks againMike Link to comment Share on other sites More sharing options...
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