2002 Denali Dash lights & guages

Where should I look to resolve multiple dash gauge problems?
Low battery
Security light
Airbag light remains on
Fuel gauge stopped working

2002 GMC Yukon Denali

All problems happened after a camper trailer drained car battery overnight.
Other than gauges, truck starts and runs fine.

check dealer for a recall. 2003 had one they fix it free.