I'm working on my 49 = 3100,I got a new speedometer and ins:-) talked it with no problems. while I was under there I decided to replace the light bulbs, when I pull out the light switch to the park light position everything works great, but when I pull it on out for headlights all the instrument panel lights go out. A the lights on the outside of the truck is working fine just loose the inside ones. Any advice would be appreciated, thanks.