 Joined: 30/04/2025(UTC) Posts: 7 Location: Bucharest, Romania
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Would anyone have a detailed wiring diagram for the Marklin 37844? Many thanks!!
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Joined: 04/02/2011(UTC) Posts: 3,563 Location: Paris, France
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Hi The 37844 is an Fx digital locomotive released in 2002 The Fx decoder located in the tender is a one pice (no 21 MTC interface) The motor is DCM (Drum Collector Motor) with a winded inductor. All wires being black makes it more difficult to identify cables Usually, if the platine/decoder are unwired, this is because it is faulty. Märklin does not provide a wiring diagram for old Fx decoders intended for tenders (2002 version) So what are the solutions?ONE to replace the platine/decoder with a 60906 decoder for all current motors (your case) Wire it like this  You will need to add a rear lamp holder (it was part of the old platine/decoder you removed. TWO replace the platine/decoder with an mLD3 (60972) or mSD3 (platine version 60975, steam sound) that will fit into the tender - you MUST replace the existing motor with a 60941 motor kit - add a lamp or LED for the tender rear lights - follow the colour schematics in these decoders  See the color codes in the red frame Cheers Jean |
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 1 user liked this useful post by JohnjeanB
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Joined: 30/04/2025(UTC) Posts: 7 Location: Bucharest, Romania
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Many thanks Jean! In fact my locomotive was dropped and the blue wire coming out from the tender popped off, and so did the brown wire. Both are still attached to the tender. The precise problem I have at this point is that I don't know where to re-solder the blue wire. I know that it has to be soldered to the motor, but I can't figure out exactly where to. Again thank you for you helpful message. Kind regards
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Joined: 04/02/2011(UTC) Posts: 3,563 Location: Paris, France
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Hi Usually, in Märklin cable colours Blue goes to the motor and brown is for chassis connection (so check if this is the case for you) Here is my Märklin BR 50 of 2012 (same chassis but different decoder Loco side  tender side  NOTE: there are differences between your loco and mine: - in your case a wired inductor, in my case a magnet inductor - in your case an Fx decoder, in my case an mSD sound decoder Cheers Jean |
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2 users liked this useful post by JohnjeanB
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 Joined: 04/08/2018(UTC) Posts: 1,159
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Originally Posted by: minizazay  In fact my locomotive was dropped and the blue wire coming out from the tender popped off, and so did the brown wire. Both are still attached to the tender. The precise problem I have at this point is that I don't know where to re-solder the blue wire. I know that it has to be soldered to the motor, but I can't figure out exactly where to. For the green and blue motor wires, they go to the motor shield. Take notice of where the green wire goes, and the blue should be on the other side of the shield on the same type of pad. e.g. like this: (they can be swapped)  the brown wire goes to the chassies ground, e.g on a soldering pad on one of the two motor shield screws. In the picture its hard to see, but its on the screw below the blue wire. Note that, according to the märklin exploded drawing, your locomotive has a permanent magnet (same as in the picture above), part no 389000 or the same as included in 60941, so a 60906 decoder is not suitable. and if you need more information on the decoder. According to the Märklin Part list, the decoder part number for your locomotive is 602758 so try googling that number, it should give you some pictures you can use, but look at the pictures and make sure it's the same decoder. Also check the number printed/embedded on the decoder in your locomotive. ref 37884 Exploded drawing: https://static.maerklin.de/damcontent/ac/20/ac20aee0a3e03e2dcac00f5f36ab2b391434542118.pdf
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2 users liked this useful post by bph
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Joined: 30/04/2025(UTC) Posts: 7 Location: Bucharest, Romania
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Many thanks! The photos a re very helpful.
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Joined: 30/04/2025(UTC) Posts: 7 Location: Bucharest, Romania
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Merci beaucoup Jean ! Originally Posted by: JohnjeanB Hi Usually, in Märklin cable colours Blue goes to the motor and brown is for chassis connection (so check if this is the case for you) Here is my Märklin BR 50 of 2012 (same chassis but different decoder Loco side tender side NOTE: there are differences between your loco and mine: - in your case a wired inductor, in my case a magnet inductor - in your case an Fx decoder, in my case an mSD sound decoder Cheers Jean
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1 user liked this useful post by minizazay
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