mineheadmike Posted November 16, 2014 Share Posted November 16, 2014 I have just fitted a decoder in an old but previously unused Patriot tender. The tender ran beautifully on DC but now I have fitted a decoder it shorts the circuit. Would a damaged decoder cause this or should I look elsewhere for the fault. With the decoder in situ I have tried putting a DC current across the motor terminals but nothing happens. Any help would be greatly appreciated. Many thanks. Link to comment Share on other sites More sharing options...
poliss Posted November 16, 2014 Share Posted November 16, 2014 Is this the tender drive with ringfield motor? If so, then it's probably the screw on the motor. It needs to be replaced by a nylon one. Link to comment Share on other sites More sharing options...
mineheadmike Posted November 16, 2014 Author Share Posted November 16, 2014 Is this the tender drive with ringfield motor? If so, then it's probably the screw on the motor. It needs to be replaced by a nylon one. Yes, it is the ringfield motor tender driven. Not having any nylon screws I replaced the left hand motor screw with a very short, slightly thicker self-tapping screw directly into the plastic casing to prevent the short. It does not reach the metal motor housing. The right hand screw is also shorter but screws in fine. I did actually test the tender before I changed the screws - I discovered this requirement too late. Has this blown the decoder? Link to comment Share on other sites More sharing options...
poliss Posted November 16, 2014 Share Posted November 16, 2014 Do you have another loco you can try the decoder in? Link to comment Share on other sites More sharing options...
poliss Posted November 16, 2014 Share Posted November 16, 2014 Suggested replacement screws are the Kadee #256 2-56 x 1/2" Insulated Nylon Screw or the Plain Nylon Cheese Head Machine Screw, M3 x 12mm. Link to comment Share on other sites More sharing options...
mineheadmike Posted November 16, 2014 Author Share Posted November 16, 2014 Do you have another loco you can try the decoder in? Unfortunately it is hard wired in, not via a plug and socket. Link to comment Share on other sites More sharing options...
Fishmanoz Posted November 18, 2014 Share Posted November 18, 2014 The decoder will certainly be blown. Link to comment Share on other sites More sharing options...
choralc Posted November 18, 2014 Share Posted November 18, 2014 The decoder will certainly be blown. Fishman, hate to hijack another's thread and I do apologise but that is exactly what I hope to avoid in my R.333 conversion. Could you please cast your eye on my installation recorded in that thread? Link to comment Share on other sites More sharing options...
Flashbang Posted November 18, 2014 Share Posted November 18, 2014 Hi I would advise you have a read through this item before proceeding any further.... http://www.brian-lambert.co.uk/DCC.html#The if you haven't tested as detailed and there is any connection between the brush strips to the metal chassis/pick up wheels the decoder will blow upon being connected to DCC! Link to comment Share on other sites More sharing options...
mineheadmike Posted November 21, 2014 Author Share Posted November 21, 2014 Thanks fellers, at least I know where I stand which is half way to resolving the problem. An expensive solution, but a least a solutuion. Link to comment Share on other sites More sharing options...
choralc Posted November 21, 2014 Share Posted November 21, 2014 Hi I would advise you have a read through this item before proceeding any further.... www.brian-lambert.co.uk/DCC.html#The if you haven't tested as detailed and there is any connection between the brush strips to the metal chassis/pick up wheels the decoder will blow upon being connected to DCC! Great resource. Decoder didn't blow up but loco runs without throttle being used, sigh. WIll start again. Link to comment Share on other sites More sharing options...
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