Quote:
Originally Posted by bozly
I have a 1971 c10 and when my parking lights and side markers are standard incandescent bulbs everything works normal. However, when I replace my parking light bulbs with the equivalent LED bulbs my side markers no longer illuminate and my turn signals are illuminated solid on my dash. Is there a quick fix to this? I'm guessing the LED bulbs don't offer enough resistance and the truck thinks a bulb is burnt out or missing.
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On 71-72 trucks the front sidemarkers ground through the front turn bulb element so the sidemarker can flash. An led acts like a diode and only allows electricty to flow one way. So when an led is used in the front turn location the sidemarker has no path to ground. You could directly ground the led sidemarker and loose the flashing capability like the 69-70, or install relays.