headlight and taillight q's

[swamp rat]

Does your truck have single 7" bulbs or the smaller dual bulbs in the front?
Is it possible that the bulbs have burned out on the low beam filiment? Same question for the tail lights. Quickest way to check them is to get a test light or multimeter and check the headlight at the connector plug and the rear socket after removing the bulb.
If no power at rhe headlight plug then check dimmer switch.