[Absolut Speed]

So at 66,600 miles, I'm driving 70mph down the highway in our 2000 Bravada. Without warning, in a flash, all the dash lights and warning lights popped on, the gauges all dropped to zero and then just as quickly, the gauges returned to where they were.

It did it again a minute later, and again later that night. But I made the return 120 mile trip without incident. Battery is new. Don't even know where to begin on this problem.

[firehawkclone]

Is your SES or check gauges light's on?

[Teutonic Speedra...]

Did the car actually shutoff when the gauges came on? And then come right back on? I had something similar happen on my 95 Honda Accord around 180,000 miles. It did that a few times. Then it finally went on my way to work one day. Had to have it flatbedded to my buddy's shop. Good thing I had a tow vehicle to take to work. When it died, it would sound like it wanted to start but wouldn't. In the end, it turned out to be the ignition switch. The contact was worn out in the "Run" position. So, me and my mechanic put the $35 ignition switch (picked up at Honda during lunch) in when I got home from work that day.

[Absolut Speed]

That sounds very familiar. It's been a little weird trying to start on occasion since Christmas. And as you describe, it came right back on when it shut down while driving. It was just a fraction of a second that it was shut down.

[Teutonic Speedra...]

Yeah, it's weird. When it happened, you hear it cranking, so you think it is a fuel issue, or plugs/wire/coil/distributor. My mechanic figured out it was the key switch shortly after he had it at his shop. It cranks and just about starts until the second you let the key go from "start" to "run". It's worth a shot.--Something to check or think about.

The mileage it happened at is pretty funky.

[Metlegleo]

I have actually experienced the same sensation in my wifes 98 Bravada. Several months later the car stranded her several hours from home. No spark at the coil. It ends up that a wire on the ignition comes loose from the steering wheel being adjusted up and down on a regular basis. If you pull off the plastic shroud on the bottom of the steering column you'll see a pink wire that comes from the bottom of the column goes into a flat connector just below the ignition switch (keyed). Check the connection there.....it is a fairly common problem on the s-10 based suv's.