Have you pulled the back seat out and checked wiring / battery / fuse block? There should be a bundle of red wires coming off the positive battery cable that feeds the car.

Also try to pull trouble codes if any. The blinking low fuel light may or may not be normal. I'm pretty sure the low fuel light on my 97 SL320 and 97 C280 are on when the key is on but engine not running as a test of the bulb.