GMC Repair: Fast turn signal light, gmc sonoma, marker lamp

Question
Rear rightside turn signal doesn't work. Changed all bulbs-front & back & confirmed they worked. Brake light comes on (same bulb). Front rightside light blinks fast & right rear not at all. When using hazard all blink but rear rightside. Checked all related fuses-they look good. I'm thinking its a ground issue. Wouldn't a flasher cause both sides not to blink if bad? I have a 2003 GMC Sonoma SLS V6, 4.3L engine.

Answer
Hi
I would look more at the socket that the ground. IF the ground was faulty, there would also be possible problems on the marker lamp and the license plate lamp. The ground is G422, and it is located In the chassis harness, at the rear of the right side frame rail.
as stated, if it is just that one bulb, I would first check the socket.