Road train lighting

[ricm]

Originally Posted by ricm

the tail/ brake lamp LEDs are connected in series

might have got that bit wrong - you'll figure it out if you look at the way they're hooked up....either way, I would suggest 5V minimum with protective resistors. I think the MFU actually provides 6V output if you measure it with a multimeter. The voltage that the LED sees is then dropped down through a protective resistor, once the LED lead is plugged in and the circuit is completed