Thanks a lot :)
I wonder if using some form of resistor between the second bulb would eliminate the extension mod requirement.
What I don't fully get is why it throws light warning if two bulbs are the same (LED) and they draw the same current at once ? If it because the LED uses less amp compared to the filament bulb?
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When researching this I tried all sorts of resistors and things but each time they got too hot for my liking - one set of designed for purpose "error out plug in kit" got so hot I burnt my fingers when testing it. The extention mod was the safest and easiest way I could think of accomplishing what I wanted to do. It took me a fair amount of time and trial and error to come up with this but if it can be improved that's cool.
Two LEDs in line isn't what causes the error light. I don't think you are understanding how the circuit has changed properly. When the pin is cut in the rear bulb holder you have created an open circuit that the car sees as a failed bulb. This means that, if you only do the red wire then connect two LEDs in the rear bulb holders and power on the car will be able to power the rear side lights and brakes as that curcuit is closed but when it tries to feed power to the pin we has cut to do this mod it will fail as the curcuit goes nowhere. This will throw a bulb out and is why a resistor/extention or something is needed.
Hope that helps you understand better