check your fuse, relay, switch and mabe bulbs
Short
Check the bulbs, then the fuse, then the switch at the pedal.
Your alternator is bad.
try the neutral safety switch
the lights and the bar holding the lights
Probable broken wire in the harness in the drivers door jamb.
head lights Jeep Wrangler 2004. They don't work where should I start
yes
Try the lightbulb it self, corrosion on the contacts
Check fuses or headlight switch
check your fuses
What are the wire color codes on the tail lights of a 03 jeep grand Cherokee?Read more: What_are_the_wire_color_codes_on_the_tail_lights_of_a_03_jeep_grand_Cherokee.