Chevrolet Suburban Brake Light Switch

I Have A 93 Suburban C2500 454 Engine Not That Any Of That Matters .. Anyways My Lights Were Working A Week Ago I Rented A Trailer ....

I Just Bought This Truck And At First The Brake Lights And Turn Signals Did Not Come On At All But When I Turned The Lights On The Left...

Both Brake Lights Dont Work I Have Tail Lights An Blinkers I Replaced The Switch An No Luck Im I Courious Cause I Have Power To One Wire...