I have a 1992 Seville with an analog dash. Suddenly the other day the fuel gauge stopped working, the a/c wont work, auto headlights will not work, when you pull the manual headlight switch it dings constantly, the fuel economy display reads zero, message center has error codes for air bag and shows 0 battery voltage. Changed the main computer as I had one available.

Any suggestions? I do not see a BCM is the insturment cluster the likely cause?

Thanks
John