Please try to reverse the polarity of the LED light if you found that the LED light is not working properly after installation
***If you are using these LED light bulbs to replace the Turn Signal light, Tail brake Stop light, Parking/Running light; depending on your vehicle electric circuit, you may need to add a pair of load resistors to prevent hyper/error flashing or malfunction problem
Cross Reference for this 7440 or 7443 LED light bulb:
7440 (single filament): 992 992A T20
7443 (dual filament): 7441 7444