my tailights wont come on when i turn the headlights on, but work when i hit the brakes. ive tried the fuses an switching the yellow box but no luck. in my repair manual it shows a round like fuse called a tailight control relay. could it be whats making it not work ? also , my gauges wont light up. ive tried the fuses an dimmer switch but nothing worked. any clues ?? i very much apprecaite it !