Flasher relay.
Flasher is bad. to replace it it is under the dash at the back of the steering column.
flasher has gone bad and needs replacing.
I have a 93 and the signal relay is on the passenger side beneath the glove box. You can reach it by pulling the plastic panel out so that you can see and replace the flasher.
On mine the flasher is behind the dash on the left side. There is an access panel similar to the fuse access panel on the right side. The flasher is behind that panel. You need to open the driver's door to see the panel.
I just did my Mom's 1991 Buick regal 3.8L. I removed the kick panel underneath the dash above the brake pedal. Follow the brake pedal arm up on the right side of the pedal. I used a mirror to spot the flasher unit. The flasher unit is held by a spring clip with the top of the unit pointing down. Just pull the flasher out of the clip and pull it down.
The 2014 Buick Regal's turning circle is 38.1 ft..
The 2003 Buick Regal's turning circle is 37.5 ft..
The 2013 Buick Regal's turning circle is 35.8 ft..
The 2004 Buick Regal's turning circle is 37.5 ft..
The 2012 Buick Regal's turning circle is 37.4 ft..
The 2002 Buick Regal's turning circle is 37.5 ft..
The 2011 Buick Regal's turning circle is 37.4 ft..