Result: pulse width modulation

ok here is a head scratcher, my 08 c350 w non led bulbs uses a single filament bulb for the tail and brake light. seems like it sends a low voltage to light it up gently for a tail light.... then a higher voltage to make the same bulb brighten...

I cant tell if the c300 has a 3 wire or a PWM-ST type. It has a black/white for turn signal a black/red wire for inner stop/tail lamp and a pink for stop/tail/park lamp. Not sure where to connect the Red and Brown wires from the converter....

I have a 2020 ford ranger xl without factory tow package. I want to install the redark proportional brake controller but cant find the 4 wires under the dash. There is an extra plug, but there appear to be more than 4 wires going to it, so it...