Hello,

I have install an ESU Loksound 5 micro into my Marklin Glaskasten (26559) and I am having problems with the motor.

When I attempt to drive forward, it drives forward at the same speed regardless of the throttle position. It has only one speed forward and stop.
It does not drive at all in reverse.

I have tested the decoder with the ESU decoder tester 53900 and the motor works fine forward and reverse at different speeds.

I have also tested the Glaskasten motor with the decoder disconnected and by applying DC voltage directly to the motor terminals and also to the soldered pins on the Next18 connector (to rule out cable fault).
Again, it drives forward and reverse and at different speeds.

So both the decoder and motor test OK seperately, perhaps they are incompatible?
This does not make sense, given the original 26559 decoder is an ESU V3 lokpilot.
I do not think using a micro decoder is a problem since the motor current draw is below the limit and it is a small model and also because the motor does drive rather than no response.

I have also tried different motor settings with the lokprogrammer, tried using the auto motor calibration mode and lastly also removing the factory capacitor across the motor terminals.

There is still no difference in the driving.

I believe I have hit the wall with no further possible causes and I cannot even return the decoder since it tests OK with the decoder tester.

Any suggestions?

Unfortunately not.
ESU wiring use orange/grey for the motor, Marklin use green/blue and they are correct (I have another LS 5 micro to compare and also the decoder functions along with front/rear lights)

I replaced the motor wires and it is working properly now. Given I tested the motor using the existing wires, it means the problem must have been the solder connection on the decoder.