Märklin 60973 and buffer capacitor

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Märklin 60973 and buffer capacitor

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mvd71		#1 Posted : 19 April 2025 07:37:54(UTC) Retweet
Joined: 09/08/2008(UTC) Posts: 1,916 Location: Auckland,		Hi Guys, Trying to finish an old project, and I have a BR111 that I have fitted the 60973 pick up shoe change over board. I also wanted to fit the Märklin buffer capacitor, but it uses the SUSI port normally and the 60973 doesn’t have a SUSI port. Can anyone supply a diagram showing where I can connect the individual wires to bypass the SUSI connection? Cheers….. Mike


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bph		#2 Posted : 19 April 2025 11:00:12(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 1,143		Here is a picture of the 60974 wired up to the 60973 (my own work, so no guarantees given ;) And if needed, a layout of the SUSI plug in relation to the MTC21 on the mSD3/mLD3 Maerklin_21_pin_MTC_mSD3_mLD3_layout_and_wire_colors.pdf (also my own work, so again no guarantees given ;)

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mvd71		#3 Posted : 19 April 2025 11:16:37(UTC) Retweet
Joined: 09/08/2008(UTC) Posts: 1,916 Location: Auckland,		Originally Posted by: bph Here is a picture of the 60974 wired up to the 60973 (my own work, so no guarantees given ;) And if needed, a layout of the SUSI plug in relation to the MTC21 on the mSD3/mLD3 Maerklin_21_pin_MTC_mSD3_mLD3_layout_and_wire_colors.pdf (also my own work, so again no guarantees given ;) Fantastic! Thank you, you’ve made my day. Cheers….. Mike

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mvd71		#4 Posted : 19 April 2025 11:59:35(UTC) Retweet
Joined: 09/08/2008(UTC) Posts: 1,916 Location: Auckland,		Originally Posted by: bph Here is a picture of the 60974 wired up to the 60973 (my own work, so no guarantees given ;) And if needed, a layout of the SUSI plug in relation to the MTC21 on the mSD3/mLD3 Maerklin_21_pin_MTC_mSD3_mLD3_layout_and_wire_colors.pdf (also my own work, so again no guarantees given ;) All wired up as per your photo. Checked decoder settings and then gave it a test run. Worked great in terms of stopping the loco from stalling However, in my particular train, I have three Roco S Bahn coaches that are connected to the loco, and in the cab opposite the loco, I have a Lokpilot fx which is set to the same address as the loco decoder. This decoder controls the cab lighting and the passenger car lighting. And the passenger car lighting is activated by f3. When I activate it, the loco speed also drops. Any ideas as to why?? Cheers….. Mike


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mvd71		#5 Posted : 19 April 2025 12:23:58(UTC) Retweet
Joined: 09/08/2008(UTC) Posts: 1,916 Location: Auckland,		Moved the interior lights to F2 on the function decoder and appears all good.

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bph		#6 Posted : 19 April 2025 15:33:57(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 1,143		Originally Posted by: mvd71 Moved the interior lights to F2 on the function decoder and appears all good. Normally Aux3 and 4 need to be always on, in forward/ rewerse mode ref manual, so it's sensible not to combine those with other functions. (On my mSD3, I used logic on the aux 3 and 4. So I can "lock" the relay in one position and only use one pickup shoe). A little tip is that if you don't need the chassis/ground to be switched, you can bypass the relay and use the 0/GL pad next to the 3 GND solder pads.

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mvd71		#7 Posted : 19 April 2025 21:28:27(UTC) Retweet
Joined: 09/08/2008(UTC) Posts: 1,916 Location: Auckland,		Originally Posted by: bph Originally Posted by: mvd71 Moved the interior lights to F2 on the function decoder and appears all good. Normally Aux3 and 4 need to be always on, in forward/ rewerse mode ref manual, so it's sensible not to combine those with other functions. (On my mSD3, I used logic on the aux 3 and 4. So I can "lock" the relay in one position and only use one pickup shoe). A little tip is that if you don't need the chassis/ground to be switched, you can bypass the relay and use the 0/GL pad next to the 3 GND solder pads. When you say bypass the relay, do you mean that normally it switches both the slider and chassis? Could you please clarify?


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bph		#8 Posted : 19 April 2025 23:54:10(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 1,143		Originally Posted by: mvd71 Originally Posted by: bph Originally Posted by: mvd71 Moved the interior lights to F2 on the function decoder and appears all good. Normally Aux3 and 4 need to be always on, in forward/ rewerse mode ref manual, so it's sensible not to combine those with other functions. (On my mSD3, I used logic on the aux 3 and 4. So I can "lock" the relay in one position and only use one pickup shoe). A little tip is that if you don't need the chassis/ground to be switched, you can bypass the relay and use the 0/GL pad next to the 3 GND solder pads. When you say bypass the relay, do you mean that normally it switches both the slider and chassis? Could you please clarify? It's just a minor thing, but yes, there is a relay on the chassis connections as well. ref the relay diagram on the board and the manual. And using the alternative chassis solder pad bypasses the relay.


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mvd71		#9 Posted : 20 April 2025 10:21:22(UTC) Retweet
Joined: 09/08/2008(UTC) Posts: 1,916 Location: Auckland,		Originally Posted by: bph Originally Posted by: mvd71 Originally Posted by: bph Originally Posted by: mvd71 Moved the interior lights to F2 on the function decoder and appears all good. Normally Aux3 and 4 need to be always on, in forward/ rewerse mode ref manual, so it's sensible not to combine those with other functions. (On my mSD3, I used logic on the aux 3 and 4. So I can "lock" the relay in one position and only use one pickup shoe). A little tip is that if you don't need the chassis/ground to be switched, you can bypass the relay and use the 0/GL pad next to the 3 GND solder pads. When you say bypass the relay, do you mean that normally it switches both the slider and chassis? Could you please clarify? It's just a minor thing, but yes, there is a relay on the chassis connections as well. ref the relay diagram on the board and the manual. And using the alternative chassis solder pad bypasses the relay. Ok, I’ll give it a try. Thanks for all your help. Hopefully I’ll get to a point I can post a picture of the finished item!


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mario54i		#10 Posted : 20 April 2025 12:00:02(UTC) Retweet
Joined: 28/03/2007(UTC) Posts: 303 Location: Torino,		Originally Posted by: mvd71 However, in my particular train, I have three Roco S Bahn coaches that are connected to the loco, and in the cab opposite the loco, I have a Lokpilot fx which is set to the same address as the loco decoder. This decoder controls the cab lighting and the passenger car lighting. And the passenger car lighting is activated by f3. When I activate it, the loco speed also drops. Any ideas as to why?? Maybe F3 sets shunting speed


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