My headlight goes bright for a few seconds on a 05 ultra then goes back to normal.

no country told at all, NO ENGINE CC TOLD 150CC?
no DRL told , have Daylight running lamps, as seen in CANADA.
A SCOOTER POSTED TO CARS?
WHY?
SOME LCM , SEE THE SUN, CALLED SOLAR SENSOR
IF IT HAS THAT THIS IS NORMAL, WITH SUN BRIGHT.
READ THE MANUAL FOR THE SCOOTER YET,
THAT BE FIRST THINGS FIRST THING.
WHAT IF THIS IS NORMAL, AND YOU WANT ABNORMAL ACTIONS?
SEEMS TO ME ICM IS BASIC NO SOLAR DETECTOR
SO IS FUSED CIRCUIT BREAKER TRIPPING
FOUND A FREE WIRING DIAGRAM FOR 50CC

All the free manuals , the wiring page is useless and blurry
so buy the manual first
he LCM is 7 pins, and why it fails Ive no clue but head lamp shorts. tops my list.
or the HL fuse is loose. any related wire loose or shorted

It could have the wrong bulb or the connector is broke inside forcing a short

check your ground from battery to engine and from battery to frame of car

You don't say what kind of car. If the headlights are HID, it's possible the High Voltage circuit is having trouble getting enough source voltage to work. Is your battery holding a full charge? That would be a typical problem.

codes p0456 and p0442

I have the same car around the same mileage, and mine have done that a couple of times. I've also noticed that it's real touchy when switching the brights on and off (sometimes only flashes bright and goes back to normal beams without "catching", and I have to do it again to turn them on). Possibly something in the wiring of that turn signal that's going out?

The red light indicates you are using more than you are making ... you have answered your question my friend. Nothing abnormal here.

well, its not the "circut breaker" aka the fusebox, so there has to be a problem with the regulator. when you say headlight "blows" do you mean the actual bulb burns out, the fuse burns out, or the light just turns off? it matters. on a side note, if your headlight stops working, its normal for all the other lights to get a little brighter due to the extra power for the headlight going to the others.

had problem like this once. firstly hold down button for 10-15 secs as there is a built in shop demo mode.when you disable this mode they will work normally, just beware people looking at them may activate it for you! this should allow them to function,when you plug them in they should flash dimly and when fully charged flash ultra bright.

time for a new lamp i'm afraid.