Originally Posted by TheJeepNut
I installed front LED's for the signal/park bulb (3157 types) a while back and they work fine with the resistors, but those things get WAY hot after the parking lights are illuminated for just a few minutes.
Edited the original post...
#1 - for the front marker/turn signal bulbs, you should only have to wire the ballast resistor onto the turn circuit. Wiring the resistor on the marker circuit is a waste of time/effort.
Even then the resistor will get hot, that's what it does. Best to bolt it to a metal pinch weld somewhere.
#2 - as others have pointed out, a lot of modern vehicles no longer use flasher relays (mechanical or electronic). The turn signal flashing is handled by the main computer (not the engine computer).
I personally believe that a lot of manufacturers are simply to lazy/cheap to program their BCM (body control module) to function with LED turn signals as standard/OEM versus LEDs.
LEDs as turn signals (and brake and marker) would be MUCH more efficient and last longer... But then they wouldn't make any money off replacing the cheap/ancient incandescent bulbs. Especially when you have to spend more than an hour taking off body panels just to replace said cheap/incandescent bulbs (don't even get me started on the headlights for a Subaru Legacy).
The wife wanted to test drive a new Lincoln MKX.
First thing I looked at was how easy it would be to get at the headlights and front turn signals. Nice and easy. The rest of the lights on the vehicle are all LED. Guess what's sitting in the garage next to my Jeep?