GMC Troubleshooting Questions? Ask a Mechanic for Answers
what year and make and model is this ?
do the right brake lights work and the right parking lights work normally ?
the odds are and is very common if just the right side turn signals are not working and the fuses are good in the inside and under hood fuse box and the bulbs are all good the problem is going to be the turn signal/flasher module located plugged into the back of the inside fuse box which is accessed by removing the under dash knee panel under the steering column on the dash and once that is removed the old one is popped out of the back of the fuse box then just pop in the new one like this picture
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how are you making out ?