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In this video you will find instructions on how to install an #ESU locomotive decoder in a #BR103 from #märklin in the scale #1:87. It will receive LED lighting, which is discussed in detail with a circuit diagram. Shopping list: 1 x decoder of your choice for #MFX, #M4, #MM, #DCC (e.g. from #ESU 54616, #Lenz, #Maerklin, #Tams, #Uhlenbrock, ,#Zimo) at least 2 outputs for the 3 light headlights (2 more outputs for red tail lights) 4 x Duo LEDs (white / red) (e.g. DT0605RWM) 2 x white LEDs (in the same color as the Duo LEDs or 2 x Duo LEDs more) 6 x 1kOhm resistor Shrink tubing If an all-current motor is installed, then a HAMO magnet to match the motor is added and if necessary a motor shield and 2 chokes / motor chokes (Märklin 516520). I recommend converting to a 5-pole high-performance motor (drum commutator). I'll show you the conversion on the BR 103 3358. You can find identical BR103 (also #E03) under 3053, 3054, 3354, 3357 etc. All Märklin locomotives (BR 101, 111, 140, 141, 120, 151, E 03) as well as #Roco, #Fleischmann etc. can be converted in the same way. You only need a DC motor, then the decoder will fit. This video is also intended to be an instruction for track sizes other than #H0 such as #TT. Chapters: 0:00 Introduction 1:20 Shopping list 2:40 Removing the engine block 3:10 Removing the light guide 3:47 Engine knowledge 6:35 Converting the engine block with a permanent magnet 9:15 Circuit diagram part I 11:30 Installing LED lights 15:30 Circuit diagram part II 19:55 Wiring and soldering 35:30 Test run 37:20 Final assembly 40:00 Driving video