Rebuilding P8 / BR38 to digital with Märklin 60903
Updated 15.06.2009
I have rebuilt Märklin 00380-1,
3099 and 34988
Decoder:
Motor:
Front light:
Wiring diagram for 00380:
Installed at the same place as the original Delta decoder. I used the mini 60902 decoder (Märklin part number 603462), not the
decoder from the 60760 set visible in the photo. The decoder is installed in the holder 456200.
Decoder functions:
f0 = front light, three in forward direction, the two lower in reverse
f4 = acceleration and braking delay off
Installation of the motor itself is very simple. You need to remove the screw for
the left hand control rods to access the lower motor cover screw.
It is not necessary to remove the rods. Carefully bend the rods aside to
access the lower motor cover screw.
Notice the flat area above the rotor shaft. Approx. 1 mm have to be cut off to
make the locomotive body fit. I used a sharp knife.
Normally I will not make any modifications, grinding, drilling or otherwise make
mechanical modifications to rare models. So, I wanted to make a new light unit in the 00380,
as I wanted all three lights on while driving forwards, but only the lower two when going
backwards, basically to be able to see the driving direction when the locomotive
is stationary just by a glance, without installing the rear lights in the tender.
I cut off the cylinder shaped parts of the light guide (213990) and put them back into the
locomotive as lenses. As light I used three SMD LEDs.
The two center pins (orange and gray) on the circuit board fits the original bulb socket, the yellow wire is connected
directly to the decoder.
