After a battery swap lost half of my electronics.

I did a battery swap and half my electronics quit working. Driver headlight, Passenger front blinker, Radio, AC, Passenger front & back door windows, back slide window, Sunroof, Doorlocks, No brake lights, I have a set of magnetic trailer lights pluged into my 4way trailer light plug because it still works All fuses are good. How can I diagnose & fix the problem without going to GMC