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DCC fitted engine causes a short circuit - Electrics - DCC - Getting You Started. - Your Model Railway Club
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 Posted: Sat Dec 15th, 2018 08:21 pm
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I have a Hornby Merchant Navy Class loco, United States Line, which came as part of a set.  I did not know at the time, but it was DCC ready.  I had thought about fitting a decoder but read somewhere that someone else had one and it was DCC ready.  So I opened it up and there it is.  So I fitted a Hornby 8 pin decoder in the socket.  I put it on the  programming track and the decoder was read and I programmed in its number.  All fine.  But as soon as I put it on the main, it causes a short circuit, as soon as the drive wheels touch.

Does anyone know what I need to do? 

Michael



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 Posted: Sat Dec 15th, 2018 11:17 pm
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Hi Michael,

Did you run it with  DC?
The comments below assume this is a decoder with an 8 pin plug.

If you put back the blanking plug does it still short? If not you have a faulty decoder/harness.

Using a multimeter check the continuity across the black red sockets.

Using the multimeter check to see that there is no continuity across the wheels (no blanking plug).

If you can get at them, check that all pins and wires are attached on the plug. Ditto the socket.

Check the motor to makes sure the orange grey wires are attached to the terminals.

With a vacant socket, put 12v dc across the motor terminals. 

With a magnifying glass, go over all wires in contact with the chassis.

Nigel








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 Posted: Sun Dec 16th, 2018 02:34 am
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gdaysydney
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and check that none of the decoder pins are protruding from the under side of the plug and touching the chassis or anywhere where they might short out



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 Posted: Sun Dec 16th, 2018 03:34 am
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BCDR
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Good one Dave, Never seen  that one as I usually throw out the manufacturers sometimes very odd wiring and cheap socket. Live accessory wires loose in a cheap harness will cause this. 
Nigel



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 Posted: Sun Dec 16th, 2018 08:00 am
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Thanks all - I will get on checking it all

Michael



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 Posted: Fri Dec 21st, 2018 10:49 am
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Did you find anything Michael or is it still on the "to do" list  ?



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 Posted: Fri Dec 21st, 2018 08:45 pm
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Aswell as the good possible answers already Hornby some years back  did actually release a load of Class 50 diesels with the socket actually wired around the wrong way it only came to light when customers started to fit decoders in them .  So that is worth checking if all else fails especially if it was a Chinese Friday afternoon job.

Brian



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 Posted: Sat Dec 22nd, 2018 03:41 pm
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If it runs with DC the bridges between Red-Orange and Black-Grey are correct and there is no short. If there is a connection on the lighting and auxiliary wires through the wiring harness/plug or through the socket/chassis without any load then that will give a short. And possibly damage the decoder. Hence my comment about checking the wiring. if one wire has come off a pin in the plug or there is a short in the socket....
If lighting is not required just cut and cap the wires from the decoder using heat shrink. 

Questionable wiring and soldering is something we do not need. Remember the 22 pin debacle? Cheap decoders tend to have cheap wiring harnesses. 

Nigel




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 Posted: Sun Dec 23rd, 2018 09:08 am
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Peter, still on the to do list I'm afraid!

Michael



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