Merry Christmas!
Have replaced the alternator & battery (within the last month) but while driving w/ headlights on (after the car is warmed up) I get the flashing 'air bag' light and all the electronics start going dim - radio, lights, etc. Any ideas out there besides gremlins under the hood?

 

Definitely check your grounds, especially the ones that attach to the front and rear of the block. You may have a short somewhere as well.

 

Thanks for the info, sixshooter!

I've been told it might be a loose nut between the steering wheel & the seat (ha ha). Seriously tho - I will check the connections you advised. Oh and luckily I found a friend of a friend who has the dealership diagnostic laptop connector doo-hicky that will fit my car, so I hope to know something this afternoon.
Other than that - I've also been told to jack it up and drive a new one underneath it. Sigh.