Most Dash Lights (and Gauges) Turn on and off Periodically before Car Shuts Off Completely

Question

Alright, I'll try to keep it snappy. 2005 Chevy Express 3500 4.8L V8. 130k miles.
Most dash lights would turn on and gauges would go dead for a couple moments and then come back periodically. It's not a flicker! Then, the van shut off while driving and wouldn't come on again. It would crank, but not make it all the way. A couple tries did make it all the way on, but then it'd shut off immediately. ABS stayed on the whole time.
Got AAA out, who charged the battery a bit and the thing turned on, but since there was too much snow, I couldn't test drive it.
Fast forward a couple weeks. I changed alternator and belt. Drove around the block 6ish times with the intermittent lights and gauge fun still happening, plus the persistent ABS. Finally, as expected, the stupid thing shut off again and I had to push it with my angry brother to a luckily open spot where it now sits.
What do you guys think?

Beefi1123 · Accepted Answer

Evidentially (or so they say), it was the fuel pump dying. $900 later and we're movin' again.

Solar Mike · Answer

A broken earth or ground cable somewhere.
Perhaps between battery & chassis or battery & body or body to chassis.
Some are small and across the gearbox mount.
While the cable may look good as the insulation is not broken the conductors can be broken or corroded.

Most Dash Lights (and Gauges) Turn on and off Periodically before Car Shuts Off Completely

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