Problem: The headlight seems to randomly go on and off. More accurately, it blinks on and off as the speed steps are change one step at a time.
Answer: You command station is set to 28 Speeds step mode but you decoder is set to 14 Speed Step mode. Two solutions:
a) Go to CV29 in the decoder and change the 14/28 bit for 28 speeds step mode.
b) Set the throttle to work in 14 Speed Step mode.
If you wish to learn more about the background why this happens, go here: Mixing Up Speed Step Modes