why does my headlights go out after 30 sec
my lights go off after 30 sec of being on and wait a min after switch has been
off they will sometmes come on
You need to do some testing when problem is ongoing, check voltage and ground for the headlamps. At the moment, I can't rule out the headlamp switch or dimmer/multifunction switch or the wiring circuits. You can usually use a jumper to bypass component, to see if system will start working. Intermittent issues can be a pain to track.
If you want wiring diagram, holler, I'll see what I can find.
Head light switch has gotten repeatedly hot, burnt out, just replace the head light switch.
Looking for a Used Jimmy in your area?
CarGurus has 240 nationwide Jimmy listings starting at $1,950.
Search GMC Jimmy Questions
GMC Jimmy Experts