i have leds bulbs throughout my trucks interior and all the park/brake/signal lights are too. i have the 4 trasistors installed so the flashers will work. Everything has been perfect for the past year and now my interior light flickers real bad and my right park light and cab do too. anyone have any ideas?

 

Two words: loose connection someplace. OK, so I can't count.

 

I'd agree with a loose or faulty connection