LED Brake, Park & Turn signal bulbs Caused electrical malfunction

[lal Naja]

I thought that I'd use LED bulbs in the front and back for Parking, Turn Signal and Brake. After I installed them I discovered that the simple swap caused the following problems.

When I used the turn signal all LED bulbs flashed as if I had used my emergency flash option. I also have a non LED center mounted brake light that flashed along with the License plate light and all instrument lights.

Some how the LED bulbs were feeding into the parking/instrument and brake light circuit. Totally weird! I was disappointed as I really like the brightness of the LED's. I re-installed the standard filament incandescent bulbs and everything functioned normally.

I had done a lot of research on how to do this. Purchased and installed a LED compatible turn signal flasher/hazard unit. Bought samples of five different LED bulbs and tested them all for visual appearance and brightness. To do this test I installed all the sample LED bulbs along with an incandescent bulb in Lucas light fixtures, mounted the lights on a wood board. Put the board on the wall in a dark room and triggered them from about 30 feet away. The LED's looked great and were brighter than the standard bulb.

I know that all the individual LED's that make up the bulb glow when in parking light mode and when the brake or flasher is applied the same individual LED's glow brighter. It's not like a double filament incandescent bulb that is two separate circuits and filaments.

Perhaps there is a different style LED bulb that I should be using that is designed for older style electrical systems.

If anyone could shed some light on what is needed to make them work correctly I would appreciate the support.

Thanks, Arthur