dash light issues!

I have a 2005 volvo with d12. Every time I hit a bump, my dash lights and radio go off. The gauges still work just the lights. Also, i get the check climate control module warning pop up on my screen that goes away almost immediately but returns just as fast. I know its a wiring problem but does anyone know if there is a certain wire in there that is prone to doing this that I can check. Is this a common problem. Thanks to anyone who can help

 

I'm guessing it would be the backlights. on my Volvo they never shut off. even with the headlights off, the gauges are lit. the light on my display goes out but the information is still on the display.

 

correct. when I turn key on, dash lights come on.

 

I think I might be taking it to Volvo. I have something really wrong now. Now my voltage gauge fluctuates from 13.4 to 11.0 back to the 12's. turn signals quit working, headlights real dim. cleaned battery cables and still have that problem. had the alternator checked and it read 13.8 volts running while my gauge said 12.4. batteries also read 13.8 while running. I even unplugged my radio to make sure it wasn't shorting out but it didn't change. its weird, if the voltage gauge reads over 13 volts, everything is fine. once it goes under 12 volts, everything starts messing up. Im gonna clean the cables on the starter and see if that changes anything. if not off to Volvo I go.