86 RX-7 GXL Radio lights
 

I just completed a rather extensive search and printed out a lot of write ups about cold solder joints for my problem.
I want to make sure I am going in the right direction.
At night, when I drive with my lights on I will try to change the radio station and find that the backlighting in the stock stereo is not illuminated. I have seen it come back on when I hit a pothole.
Its not a big problem but it is mildly annoying because sometimes theres no potholes aroung when I want to see what channel my radio is set to?