G'day,
I replaced the 3 brake lights with LEDs, the two on the bumper work fine however the eye level one doesn't come on and only flickers for a fraction when the brake pedal is released. The incandescent bulb works fine.
I checked with the supplier and they said it was an earth issue. I checked for power/earth using a pen tester thingy and a multimeter, both show power with or without the LED inserted.
Any ideas ?