Replaced stock brake lite with a new led. Why while bike is idling the LEDs are pulsating . Can anyone. Help

Are they polarity concience, some are.

After you replaced 2 bad leds the back lights stopped working?Possible that when you did the soldering you may have inadvertently shorted something out? Was working before you touched it so ...............Th is a puzzlement.
Meanwhile is set connected to signal source? If so you should at least have audio. If not that alone is a main board issue. You might want to check this site for further info and parts
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Th first thing I would do is put one of the old tail lenses back into the car and see if everything is back to normal. If it is there is a problem with the new lenses you installed.

Led lights are very sensitive to proper power and ground. Bad grounds can make all kinds of weird things happen.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

u need a resistor something to reduce the power ur board in the light shuld have one built in it may have gone leds run on typicaly around 3v ur bike produces between 12 and 14 v its the same as when u fit led indicators u need to restrict that power down

im asumeing the brake light dont work because the leds are dead not because there is no power to them

best advice i can give is u need a in line resistor similar to the ones used on led indicators they take away some of the power and release it as heat energy with the decresed current the leds shuld be almost just as bright and last a lot longer hope this helps

pulsates ARE normal for this truck it means abs is working.
if truck pulls to the right then the LEFT brake caliber is not working right check to see if rusted up... also install NEW calb. BOLTS never reuse old one if one is bent calb. wont slide correctly

Led lights are great the only problem with them, sense they use way less energy to operated, they are also more sensitive to engine. Most the time it is a ground issue. If your original non led light, did not have this problem, and now with the LED, it does it, then you need to ground it on frame, or another spot that does not continue at all in through engine components. Its kind of like headlights on bikes and cars, IF you notice on a lot of bikes, when head lights are on, and you rev engine, lights get little brighter. Same kind of thing with LED, difference is the LED , sense are brighter, but require less power to operate, the draw back is more sensitive to power surges or anything on engine. So, try and ground it in different spot, or run additional ground. And try to not have hot wire in main component circuit. Thanks Mike

This may be a model that has two common fauluty parts. To be sure check with the site www.TvRepairKits.com - they likely have a kit to fix it.

your battery needs to be replaced ...it is exhausted ...

your flasher unit charges and discharges quicker as the wattage of the lights youve inserted are lower or not equivalent to the ones you replaced, dealerships will disapprove assisting with these as they are off standard best would be to either change the flasher unit according to the wattage required by your lights or take it to a qualified bmw electrician.