I tried replacing my tail/brake lights for my 2013 Rav4. Dual purpose bulb.
Replacing with the LED bulb and with the headlights on (i.e. tail light on), results in the brake lights always on. With headlights off (i.e. tail light off), the brake lights function as it should - when the pedal is pressed.
The oem bulb is 25 Watts and this LED bulb is 3W. Assuming a 12V system, the oem uses 2amps and the led 0.25amps.
So my thinking is that too much current is being sent to the bulb when just the taillight should be on.
So do reduce the current, I was thinking of adding a 50ohm resistor.
Does this make sense?