99 (old Body Style) GMC

I just had trailer lights and hitch installed on my truck. Now I have no dash lights. I am 400 miles from where I got the job done. I checked the manual and its says the power locks are wired to the dash lights. The locks works. Did the people at U Haul do something wrong and burn out all bulbs or is there another fuse to check? Or does someone know what is wrong? Thanks

Usually the dash lights are on the same fuse as the parking lights on the OBS, UHAUL may have messed something up on the install. I believe the fuse is in the interior fuse panel.