This is an important question, and something I'd LOVE to be able to learn how to do, especially since I have a multimeter but no clue how to use it. If my original plan to run both my door reflector and LED door panel strip to the OEM door sill end up being too dull, that's concerning.Eric -
Not too sure on your set-up and where you are tapping into. Is it possible the door sill plates (where you are tapping into) is getting less than 12V? I doubt your wire run would cause any issue, too short for the low amp draw of LEDs to be of any significance.