westonman Posted February 23, 2017 Share Posted February 23, 2017 Hi all i have tried fitting a Hornby TTS decoder into a Bachmann class 47 using an 8 pin to 21 pin adapter. Whilst the sound works ok the lights will not operate is this because the wiring to the 21 pin is not compatible with the 8 pin plug. Any help appreciated. Regards Bob Link to comment Share on other sites More sharing options...
RAF96 Posted February 23, 2017 Share Posted February 23, 2017 I would be looking at the 8-pin and 21-pin standard wiring configurations and comparing notes - as it were. Rob Link to comment Share on other sites More sharing options...
RMweb Gold MikeParkin65 Posted February 23, 2017 RMweb Gold Share Posted February 23, 2017 Hi all i have tried fitting a Hornby TTS decoder into a Bachmann class 47 using an 8 pin to 21 pin adapter. Whilst the sound works ok the lights will not operate is this because the wiring to the 21 pin is not compatible with the 8 pin plug. Any help appreciated. Regards Bob I have the Hornby TTS working in a Bachmann 47 using the Bachmann 8 to 21 converter. The lights will work but note that early production of this chip had the yellow and white wires transposed so lights work in opposite order to direction. The only fix for this is to swap these wires over unfortunately - it can't be done via CV's. Other things to watch out for are hesitant running - partly addressable by CV changes, lights that turn off when coming to a stop (a change needed to CV29) and in my experience 'general unexpected behaviour'. My experience of Hornby chips (sound and non sound) is that aren't the most reliable - for sound we are getting what we pay for with the big names. Link to comment Share on other sites More sharing options...
westonman Posted February 23, 2017 Author Share Posted February 23, 2017 How have you got the lights to work? i thought the 8 pin plug was in the wrong way round so swapped it over but it made no difference. Bob P.S. Have just noticed the adapter is not Bachmann have sent for one of theirs to see if it makes any difference. Link to comment Share on other sites More sharing options...
RMweb Gold MikeParkin65 Posted February 23, 2017 RMweb Gold Share Posted February 23, 2017 How have you got the lights to work? i thought the 8 pin plug was in the wrong way round so swapped it over but it made no difference. Bob P.S. Have just noticed the adapter is not Bachmann have sent for one of theirs to see if it makes any difference. Two thoughts, have you set the two switches under the fuel tank to 'On'. Then, have you turned the lights 'on' via the functions on your controller (I'm at work so can't tell you which function key the lights are mapped to - I have an NCE powercab and I turn the lights on via the 'Headlight' button).Failing that, have you a 21 pin decoder you can use to make sure the lights are working on the model - the 47 has those clipped on connections to the circuit board rather than a soldered connection - quite common for these connections to be not working. I soldered all the connections on mine when I fitted the chip. Link to comment Share on other sites More sharing options...
westonman Posted February 23, 2017 Author Share Posted February 23, 2017 The switches are on and the lights work ok with a 21 pin chip. I also have an NCE Powercab and use the headlight function have also tried function 0. Bob Link to comment Share on other sites More sharing options...
RMweb Gold MikeParkin65 Posted February 23, 2017 RMweb Gold Share Posted February 23, 2017 Just looked at the 'old' thread for this - http://www.rmweb.co.uk/community/index.php?/topic/99656-Hornby-railroad-class-47-tts-sound/page-2 . With the chip installed wrong way around - no lights - that matches your first situation. With the chip installed the correct way around you should have working lights but reversed. However, I found lights turn off when stationary when using the power cab. Googled this and found an answer on the Hornby Forum which works - set CV 29 to 37. All this is making me question the wisdom of my pre order for the forthcoming Class 31 and 37 TTS chips - are 3 'temperamental' chips really worth more than one top quality bullet proof Loksound or Zimo from the likes of Legoman or PaulieBanger? Link to comment Share on other sites More sharing options...
westonman Posted February 25, 2017 Author Share Posted February 25, 2017 Hi i have now got it sorted,altered cv29 to 37 lights worked on rear but front lights would only come on if i twiddled the 21 pin adapter. Found out it was faulty changed it a Bachmann one and everything is now o.k. Thanks for your help. Bob Link to comment Share on other sites More sharing options...
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