One taillight will not turn off

[jimmythehand]

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?