Educated guess might the regulator brushes.
If I run the heater, lights, seat warmers and the rear defroster all at once, the ABS and SRS warning lights come on. The manual says this may happen. The bun warmers take a lot power.
Suggest you check the brushes. They go more often than an alternator.
The battery might be suspect as well.
Finally, check the ground connections -- especially by the battery. I found a loose one that caused the lights to come on more often than they do now.