it's the relay
it called your turn signal is on
No. But he works for the 'Light Side'.
The owners manual indicates fuse # 12 in the Fascia fuses is for the number plate and a number of other things including Hazard lights.
It should be the fuse, in the fuse box at the Driver Side, check for the number 10 Fuse (7.5 Amp) it might be blown
Check the bulb.
Bad hazard switch.
Hazard light on the 1991 Buick Regal is on the right side of the steering column. It is an unassuming black rectangle which slides up to activate.
On the left side of the steering column there is a light black tab that you pull down.
Its the turning signal/flasher module, left side of dash behind the fuse box. Its a dealer part only about 98.00
Work from behind light fixture Remove wire clip and twist bulb to remove Note: The above only works for the passenger's side headlight. The driver's side light is harder to get to. To replace the driver's side headlight remove the battery and it's hold down.
You probably have a socket grounding out.
Burnt out lamp if maybe only the rear or front works and the other still works. If the whole side is out back and front, then it may be the switch. Could be the flasher unit too but doubtful if one side is working.