Post by
elecfus »
https://forums.nicoclub.com/elecfus-u268885.html
Wed Jan 18, 2017 7:38 am
LED bulbs are no good for old cars. I had an old '88 Honda legend, replaced all the dash bulbs with LEDs, had to take them out the next day. every bulb stayed lit. if I had to guess, I'd say it was something to do with floating voltage (voltage not staying at 0V for off) which wasnt a problem with incandescents.
or rather, the way lights work, is that the positive lead isnt clamped to ground when it's switched off. meaning it will float high, getting a signal from the noise in the cars electronics and keeping it on.