One taillight will not turn off
 

1968 camaro with aftermarket billet taillight housing with Digi-tails LED lights. After washing car, the passenger tailight will not turn off. Cannot find any evidence of water inside the car or trunk. Taillight still functions properly with turn signal, braking illumination and hazard. Just will not turn off when car is turned off. another interesting piece of info, i have an ignition kill switch in trunk and when i turn the switch the tail light then blinks slowly. Any thoughts?

Check your grounds. Also turn signal switch could be bad. I had a similar issue with standard lighting and found turn signal switch was bad.

I have the EXACT same situation. Same lights, same car, happens after washing, still functions, but stays on. Once dry it goes out and works normally. Has been this way for over 7 years now. I just live with it. I have checked grounds etc, even had an electrician take a look and he couldn't find anything. I suspect that it's water / condensation across the actual LED board that causes it

it has been 3 days since washing. how long did it usually take to dry for you?

Usually dries by next morning