Why would the turn signals and brake lights stop working on a 1998 Sunfire It has wiring for a trailer would this be a prob?

First check the fuse block there is an access panel located just inside the drivers side dooron the side of the dash, locate the proper fuses to check using the diagram provided on the inside of the access door panel. If those fuses are O.K. check under the hood, to the left side as you are facing the vehicle, there is another fuse block, it is clearly identified by a daigram on the top of the plastic cover. It is right along the fender. check the fuses here, most likely the one marked "Battery 2".