@stan2004 posted:
Actually that caused me to scrounge for a photo of what I think you may be referring to. To my earlier observation about heat shrink length:
The heat shrink AT THE LEDs in this harness is much shorter (about 1/2") than the 4-LED version under discussion. This suggests there is NO resistor on this 2-LED version. OTOH, the heat shrink length AT THE 2-pin CONNECTOR is much larger...suggesting something is "going on" underneath! I believe this is where your series connection is made. On the 4-LED version there is no such heat shrink at the connector and you see the red and black wires going right thru.
@stan2004 and @gunrunnerjohn I carefully removed the heat shrink. There are no resistors. I agree that these LEDs are in parallel and must be fed by a current limited circuit in their original home (FM Trainmaster).
Can I feed the four GOW bulbs for the number boards directly from the buck converter at 6 VDC and also feed the “20110 LED Lighting Regulator” 6 VDC from the coverter and have the current regulator feed the four LEDs for the marker lights? Or just use the buck converter for the GOW bulbs and use the “20110 LED Lighting Regulator” to power the LEDs?
Here is the pic of the harness with the heat shrink removed.
