My turn signals,wipers,back up lights,and directional device does not work! Help

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All fuses are good! I replaced the flasher relay! I replaced the turn signal switch! When the brake is applied the turn signal light on dash comes on but only the front turn signal lights come on ! All light bulbs are good. The fuse for trailer turn signal blows not when I put it in but usually blowed the next time I check it! Any help would b greatly appreciated!!!