Driving home last night in the 99 'burban when on a particularly dark bit of back road....the headlights blink out. I can see slightly by the illumination of the corner lights and I hit the hazards immediately for the bit that they will bring to things. Pull off to start checking fuses, they are fine but about a minute after pulling off....the headlights pop back on!
So, what do we think? Headlight relay? I'd just as soon this not happen again. 
Ground, relay, bulb, switch ...
99 'burban? You sure it isn't an any year and model English or Italian brand? 
Lack of dependable ground/s can be a SOB to deal with in any ride. Since your ride about 15 years old, even if a ground issue is not you headlight problem this time, it's an issue to anticipate. On a warm and comfortable day. Time spent through and repairing, tightening, & cleaning grounding devices is always a great piece of preventive maintenance.
Beats the hell out of having a no drive, no lights, no heater motor, etc. situation on a cold dark night!
I've read where it can be a wiring issue in the steering column related to the dimmer near the cruise wires.
Years of flexing etc.
hMMM, possibly related. On occasion when jarred over a bump on the highway the cruise control will kick off and have to be reset.
I had a 95 or so chevy truck that would occasionally do that. Wiggling the headlight switch a bit would get them to come back on.
The headlights went totally stupid in my '94 Suburban when the E36 M3ty aftermarket switch started to fail. They wouldn't turn off randomly, but they didn't like to turn on initially. A trip to the junkyard fixed it.
Multifunction switch.
I thought this was going to be another GGA thread.
Ghosts. Or maybe demons.
Sympathy Glitches?
does it have a circuit breaker ? Most do and if there is a short the lights will shut down until the breaker cools, lights on and off.
I was followed by a Dodge/Ram truck one day and his headlight were blinking repeatedly.
What about getting yourself a set of secondary lamps... something you can snap on IF it happens again
My '85 Chevy dually does the same thing once in a while. The problem involves the high beam switch on the steering column. I'll be rewiring that circuit to something a little more dependable soon enough.
In reply to Dr. Hess: sorry to disappoint. I was a fan but won't be the one to reopen than particular can o' worms.
First, I'd head for the headlight switch and dimmer switch connectors, and look for melted E36 M3.
Headlamps are normally on a thermal reset (bi-metallic strip) to protect the wiring check for shorts / chafed wires. If you've added any aftermarket lights to the circuit and did not use a relay there's your problem. I had a freeing who tapped in some KC highlights on to his 80 Fiesta and the added 110w load would make the lights cycle it was real fun doing 85-100mph down the Vermont hiways holding a cigarette lighter spot beam out the window just incase the headlights went off......
Don49 wrote: Multifunction switch.
This. Especially since you brought up the cruise control quirk as that's wired through the same switch. It's a fairly common problem on those things.
You'll need to log in to post.
