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Upgrading to digital - Problem with motor
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Offline JJ922  
#1 Posted : 19 September 2025 23:10:41(UTC)
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JJ922

United States   
Joined: 03/06/2025(UTC)
Posts: 6
Location: Maryland, Baltimore
Hi, new to working on models trains. I have a Marklin 3317 that I’m trying to upgrade to digital with sound. I have the sound working but the motor will not move forwards or backwards. Any thoughts would be great appreciated. TIA

-Jake
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Offline JohnjeanB  
#2 Posted : 19 September 2025 23:38:43(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,635
Location: Paris, France
Hi Jake
A warm welcome to this great forum.
If I am not mistaken the 3317 is a french steamer of Etat railways.
It was released in 1991 as a one-time serie.
It is fitted with a drum collector motor (DCM) with a coil inductor, suited for AC operation.
You don't say which decoder you are using
Märklin sound decoders mSD3 require you to change the motor (AC) into a DC one.
Märklin calls it an HDLA and for DCM motors you need a 60941
Only then can you drive the loco with a sound decoder.

If you wish to keep the existing motor, then there is a special decoder for "All current motors" in wired form (60906)
The loco will perform no better than it was in analogue (no load regulation), will have no sound but will understand analogue and digital in 3 formats MM2, DCC, MFX

Cheers
Jean
My layout videos
latest vid
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My Layout
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Offline JJ922  
#3 Posted : 20 September 2025 00:24:48(UTC)
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JJ922

United States   
Joined: 03/06/2025(UTC)
Posts: 6
Location: Maryland, Baltimore
Cheers thank you for the reply. I have the high efficiency motor 60943, and am using the MSD3 decoder set.
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Online DB Fan  
#4 Posted : 20 September 2025 01:51:54(UTC)
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DB Fan

United States   
Joined: 01/03/2016(UTC)
Posts: 287
Location: Colorado
Hello
Did you install the brushes after the conversion? I forgot them before and took me a little to figure it outBigGrin .
Maybe a wire came loose? Happened to me also. It was in shrink tubing and only found it when I tugged on it and it came out. I would check everything over with the shell off on a programming track and would wiggle on some off the wires to see if the engine moves or some other reaction. Been there done that. Good luck.

Robert
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Offline JJ922  
#5 Posted : 20 September 2025 03:16:03(UTC)
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JJ922

United States   
Joined: 03/06/2025(UTC)
Posts: 6
Location: Maryland, Baltimore
Originally Posted by: DB Fan Go to Quoted Post
Hello
Did you install the brushes after the conversion? I forgot them before and took me a little to figure it outBigGrin .
Maybe a wire came loose? Happened to me also. It was in shrink tubing and only found it when I tugged on it and it came out. I would check everything over with the shell off on a programming track and would wiggle on some off the wires to see if the engine moves or some other reaction. Been there done that. Good luck.

Robert


Thanks, just checked it and it seems to be holding. What I have connected is:

Red to red
Grey to motor connection
Orange to motor connection
Browns to speakers (works properly)
Yellow to rear lights
White to front lights
Black to ground on motor

Maybe I did it wrong.

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Online DB Fan  
#6 Posted : 20 September 2025 05:09:56(UTC)
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DB Fan

United States   
Joined: 01/03/2016(UTC)
Posts: 287
Location: Colorado
Hello
I’m not that familiar with Marklin decoder wiring since I use ESU decoders. I think it would be helpful if you could post a picture of the wiring you did so others who are more familiar with the Msd3 decoder can take a look at it and can help with your problem. Sorry that I couldn’t be of more help.

Robert
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Offline Normmeister  
#7 Posted : 20 September 2025 09:16:01(UTC)
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Normmeister


Joined: 15/04/2011(UTC)
Posts: 52
Location: Australia
You have wired the loco to the colour code that everybody (except Marklin) uses.
The Marklin code is :
red and black (or brown): track connections.
blue and green : motor connections
orange : V+ common for lights etc.
from memory, yellow for front light, grey for rear light.
brown for speaker (I think).

Norm in Oz.
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Online bph  
#8 Posted : 20 September 2025 10:38:45(UTC)
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bph

Norway   
Joined: 04/08/2018(UTC)
Posts: 1,213
Originally Posted by: JJ922 Go to Quoted Post

Thanks, just checked it and it seems to be holding. What I have connected is:

Red to red
Grey to motor connection
Orange to motor connection
Browns to speakers (works properly)
Yellow to rear lights
White to front lights
Black to ground on motor

Maybe I did it wrong.

Wiring seems to be correct if you used a 60985 mSD3 decoder or similar, but it's wrong if you used a 60975 or similar. What did you use ? Do you have a picture of the installation?
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Offline JJ922  
#9 Posted : 20 September 2025 11:09:48(UTC)
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JJ922

United States   
Joined: 03/06/2025(UTC)
Posts: 6
Location: Maryland, Baltimore
Originally Posted by: bph Go to Quoted Post
Originally Posted by: JJ922 Go to Quoted Post

Thanks, just checked it and it seems to be holding. What I have connected is:

Red to red
Grey to motor connection
Orange to motor connection
Browns to speakers (works properly)
Yellow to rear lights
White to front lights
Black to ground on motor

Maybe I did it wrong.

Wiring seems to be correct if you used a 60985 mSD3 decoder or similar, but it's wrong if you used a 60975 or similar. What did you use ? Do you have a picture of the installation?


The decoder is a 60985 kit, I can take pictures later in the day. Thank you
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Offline cintrans  
#10 Posted : 20 September 2025 21:46:12(UTC)
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cintrans

Aruba   
Joined: 11/07/2018(UTC)
Posts: 233
Location: Aruba (general), Oranjestad
Jake

Your connections seem to be OK

What you could do is check with a volt meter / ohm meter if your circuit is OK
Measure on the poles of the motor (grey and orange wire) if voltage is reaching the motor, alternatively you could de-solder the wires and put a DC voltage straight on the motor (e.o. with a 9V battery or something) and see if the motor works like that.

Regards
Jean-Pierre
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Offline Johnvr  
#11 Posted : 20 September 2025 23:19:07(UTC)
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Johnvr

South Africa   
Joined: 03/10/2010(UTC)
Posts: 1,300
Location: Cape Town, South Africa
Originally Posted by: JJ922 Go to Quoted Post
Originally Posted by: DB Fan Go to Quoted Post
Hello
Did you install the brushes after the conversion? I forgot them before and took me a little to figure it outBigGrin .
Maybe a wire came loose? Happened to me also. It was in shrink tubing and only found it when I tugged on it and it came out. I would check everything over with the shell off on a programming track and would wiggle on some off the wires to see if the engine moves or some other reaction. Been there done that. Good luck.

Robert


Thanks, just checked it and it seems to be holding. What I have connected is:

Red to red
Grey to motor connection
Orange to motor connection
Browns to speakers (works properly)
Yellow to rear lights
White to front lights
Black to ground on motor

Maybe I did it wrong.



Perhaps just for clarity :
The black wire from the decoder goes to the chassis ground, but it must not touch any motor ground.

"Black to ground on motor "

By the way, I'm not sure which light bulbs you have in the locomotive.
If the light bulbs are grounded to the chassis ground, they will flicker with the AC current.
To prevent flickering of lights, you can connect the blue wire from the decoder as ground for the lights.
If you attach a picture of the lights, then we can see whether the lights should be grounded to the blue wire.


Regards
John
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Offline JJ922  
#12 Posted : 21 September 2025 18:15:11(UTC)
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JJ922

United States   
Joined: 03/06/2025(UTC)
Posts: 6
Location: Maryland, Baltimore
Originally Posted by: Johnvr Go to Quoted Post
Originally Posted by: JJ922 Go to Quoted Post
Originally Posted by: DB Fan Go to Quoted Post
Hello
Did you install the brushes after the conversion? I forgot them before and took me a little to figure it outBigGrin .
Maybe a wire came loose? Happened to me also. It was in shrink tubing and only found it when I tugged on it and it came out. I would check everything over with the shell off on a programming track and would wiggle on some off the wires to see if the engine moves or some other reaction. Been there done that. Good luck.

Robert


Thanks, just checked it and it seems to be holding. What I have connected is:

Red to red
Grey to motor connection
Orange to motor connection
Browns to speakers (works properly)
Yellow to rear lights
White to front lights
Black to ground on motor

Maybe I did it wrong.



Perhaps just for clarity :
The black wire from the decoder goes to the chassis ground, but it must not touch any motor ground.

"Black to ground on motor "

By the way, I'm not sure which light bulbs you have in the locomotive.
If the light bulbs are grounded to the chassis ground, they will flicker with the AC current.
To prevent flickering of lights, you can connect the blue wire from the decoder as ground for the lights.
If you attach a picture of the lights, then we can see whether the lights should be grounded to the blue wire.


Regards
John


Thank you, I just reworded the motor and changed the ground spot for the black wire. The motor will move the train about 1” in reverse so I swapped the orange and grey wires. Now nothing not even sounds. Power is getting to the motor I believe, or at least it was.
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Offline JJ922  
#13 Posted : 21 September 2025 21:33:02(UTC)
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JJ922

United States   
Joined: 03/06/2025(UTC)
Posts: 6
Location: Maryland, Baltimore
The engine will now run full speed in reverse with no working sounds or control.
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