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here is howw it goes, the power from the fuse goes to the brake switch then to the signal light switch and from there to the rear lights, test for signal from the brake switch to the turn signal, if good the signal switch is bad
the break light wire on the lumina runs through the blinker switch or multifunction switch on the colum.. check there as well as at the tail light sockets. on the late 90s gm cars the sockets had a tendancy to rot away... use a test light at the brake light wire in the trunk and have a friend apply the break. if there is power then may have to get new tail lights. or replacement bulbs.