Start bu checking the bulbs. If ok, check the grounds for the lights, If ok and not getting voltage, check for voltage comming out of the turn signal switch.
Next to the radiator on the drivers side, in front of the battery.
its in the owner's manual. usually with pictures.
I believe it's the front one on the drivers side of the vehicle.
Under the car on drivers side, about even with rear of front wheel well
Drivers side under the car in front of the gas tank. Mounted under the car.
check the condition of the tire it might have a nail in it
It is on the exhaust pipe just before it passes under the firewall and is best accessed by removing the drivers side front wheel.
The firing order is 123456, 135 are on the passenger front to back and 246 are on the drivers side front to back I forgot to tell you clockwise.
it is in a small black box under the hood to the left if standing in front or drivers side. ...
the front side of engine bay near the battery drivers side
it could be a exhaust leak.
The 1990 Mazda 323 horn relay switch can be found on the front drivers side quarter panel. The relay switch will be on the inside of the quarter panel.