Car question. Electronics. Brake lights.?

my professional opinion is the turn signal switch is malfunctioning. the 3rd brake bulbs don't go through the switch. that's why they operate.

Have someone step on the brake pedal and check for power on the yellow wire (left side) and dark green wire (right side). Power goes from fuse #23 through the brake switch and then through the turn signal switch before it heads back to the tail lights. The high mount power goes straight from the brake pedal switch to the high mount bulbs. There is no 3-in-1 bulb. It's a 2-filament bulb. Low filament for tail lights, high filament for turn and stop functions.

ok, I relatively have an thought. For the step up it would desire to count on how your vehicle is desperate as much as prepare capacity to the brake lighting fixtures once you step on the pedal. in case you will be able to desire to combine a relay interior the circuit, you have the relay bypass a 2d set of resistors interior the circuit that entirely dim the circuit extra. case in point, while the brake pedal is interior the resting state, each led could have 2 resistors a 330 or 220, or besides the fact which you deem suited to the lit voltage and a 2d one which will face as much as present day extra (i do no longer understand, perhaps yet another 220) while the brake pedal is depressed, the relay shorts this 2d resistor or units of resistors and the LEDs now replace into brighter. in spite of the fact that, you will be able to desire to set the circuit up so as that the brake pedal helps extra present day to head from the battery by using an lively relay. Secondly, positioned the LEDs in parallel, each with their very own present day restricting resistor. i will think of of a pair of distinctive a thank you to try this with a microcontroller, yet in an analog gadget, i could think of those may be the easiest to layout and enforce. *EDIT* It does not count besides the fact that if LEDs are in parallel or sequence. It does count how plenty present day you place by using each LED although, many times you place a resistor in sequence with a introduced approximately minimize the present from popping the LED wish this makes some experience.