Ub 709 SJ - Add Switching Lights

Recently I bought the Swedish Ue 499 SJ from Märklin (36350) and was surprised to find a SMD LED circuit board under the roof, but it wasn't connected to the mainboard/decoder.


Ue 499 SJ - Märklin 36350

First, I thought, this is a cabin light and modified the Ue 499 SJ to cabin lights (see https://www.marklin-user...99-SJ---Cabin-light-mod)

But later, I relized, this isn't a cabin light but Switching Lights of the older version Ub 709 SJ of the Ue Series.


Ub 709 SJ - Märklin 36352

Therefore, I checked the manual of the eralier Märklin model 36335 and found the same circuit board there, but with the correct lamp cases:



As the lamp case is missing, I created a CAD model and printed it with my 3D printer:


CAD-Entwurf mit FreeCAD 0.18


3D Print with PLA

The print looks ugly, but it is really a very tiny part. It doesn't care, when mounted into the loco.


Circuit board with glued lamp cases

For the funktion of the Switching Lights I use AUX 1 port, because AUX 1/2 are free, AUX3/4 are used for the Telex. The SUSI board AUX F4 and F7 are not function because of an defect of the mainboard. I had to remove the resistor from the SUSI board near AUX 1:


AUX 1 with new brown wire






Cabin Lights for the Ue 499 SJ
Because I had to convert both machines for this, I decided to create a small cabin light for the Ue 400 SJ


Circuit board with warm-white SMD LEDs