As stated above, what are you working on specifically? Cuz a manual and auto have completely different setups. I'd assume an auto. First to check is always the bulbs, then grounds, then with the switch on (truck not running), play with the shifter to see if you can get the lights to come on. You likely just need to adjust the switch on the column a bit. When my truck was auto, I had to push the shift lever up to the top of reverse to get the lights to come on.