Can anyone advise me about electronics? I have an elderly Shay loco and the lights, headlight and rear are non functioning. I have made a new circuit which works fine as I want it to except when I run the circuit with a motor connected for testing, the LED light flickers? without the motor, no problem constant brightness? can anyone help me with a cure, I think I may need a capacitor in the circuit, but I am a mechanical man dabbling in electronics and getting a bit out off my knowledge zone?? Help

I am trying to fit the phoenix sound unit PB9 to my K27. I have connected up the unit and have sounds, but am at a loss as to how to use the chuff sensors in the cylinders, am trying to follow instructions which seem to indicate the need to get power into the sensor units before I can get a response? Can anyone help please?? Not very electronically wise so please keep it as simple as possible??
I have installed this sound unit in a previous K27 loco, but then used a reed switch and magnets on the rear axle, worked fine, is this the best way to go?

Many thanks for any help