David1226
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The first thing we need to establish is that I am completely clueless when it comes to model locomotive digital wiring. I need help (some may say that I am way beyond help) as it is a complete mystery to me.
I have a LGB 20790 Corpet Loupet which was bought some years ago, second hand, from eBay. It had been fitted with an after market chip, presumably by the previous owner. The loco never ran properly but I never bothered to do anything about it at the time. When run on DCC there was a loud buzz coming from it. I experimented with the dip switches in various positions but nothing made any difference. I was of the opinion that the decoder itself was faulty.
Also, some years ago, I acquired three brand new LGB 55027 loco decoders at a very good price. I have now decided it's time to get this loco up and running. I have stripped out the old decoder and attempted to wire in one of the 55027. The manual supplied with the decoder does not help me identify which colour wire goes where. I started by cutting off the 10 pin connector as this does not fit the existing board in the loco.
I have wired the track pickup and motor wires and the loco runs nicely back and forth along a length of track. I am at a loss to know which coloured wires need to be connected to power the front and rear lights and the smoke unit. There are no other functions of interest.
Fig 1. LGB 55027 Decoder
![P2070001.JPG P2070001.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441173_P2070001.jpg)
![P2070005.JPG P2070005.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441175_P2070005.jpg)
Fig 2. The LGB 55027 wired into the loco pc board for track power and motor control.
![P2070002.JPG P2070002.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441177_P2070002.jpg)
Fig 3. The old decoder
![P2070004.JPG P2070004.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441179_P2070004.jpg)
Fig 4. The six pin connector that connects the old decoder to the loco pc board.
![P2070003.JPG P2070003.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441181_P2070003.jpg)
Any advice/assistance would be much appreciated.
David
I have a LGB 20790 Corpet Loupet which was bought some years ago, second hand, from eBay. It had been fitted with an after market chip, presumably by the previous owner. The loco never ran properly but I never bothered to do anything about it at the time. When run on DCC there was a loud buzz coming from it. I experimented with the dip switches in various positions but nothing made any difference. I was of the opinion that the decoder itself was faulty.
Also, some years ago, I acquired three brand new LGB 55027 loco decoders at a very good price. I have now decided it's time to get this loco up and running. I have stripped out the old decoder and attempted to wire in one of the 55027. The manual supplied with the decoder does not help me identify which colour wire goes where. I started by cutting off the 10 pin connector as this does not fit the existing board in the loco.
I have wired the track pickup and motor wires and the loco runs nicely back and forth along a length of track. I am at a loss to know which coloured wires need to be connected to power the front and rear lights and the smoke unit. There are no other functions of interest.
Fig 1. LGB 55027 Decoder
![P2070001.JPG P2070001.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441173_P2070001.jpg)
![P2070005.JPG P2070005.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441175_P2070005.jpg)
Fig 2. The LGB 55027 wired into the loco pc board for track power and motor control.
![P2070002.JPG P2070002.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441177_P2070002.jpg)
Fig 3. The old decoder
![P2070004.JPG P2070004.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441179_P2070004.jpg)
Fig 4. The six pin connector that connects the old decoder to the loco pc board.
![P2070003.JPG P2070003.JPG](https://cdn.gscalecentral.net/2022/02/thumb/441181_P2070003.jpg)
Any advice/assistance would be much appreciated.
David