It is not a batter light, it is a charging system light. It is on because there is a problem with the charging system. Most likely a defective alternator.
12 volt 10 amp charger is what you need.
Dead battery, loose or corroded battery terminals, defective starter, solenoid, or ignition switch.
Inadequate ground connection!
1982 Toyota pin-out connections to alternator?
The fuse boxes are located on the drivers side at the bottom of the dash board, and in the engine compartment by the battery.
1982 Toyota PU timing belt or chain
Toyota Camry was created in 1982.
Toyota MasterAce was created in 1982.
Toyota Vista was created in 1982.
I would try pulling the bulb out and see what happens from there.
bolt pattern on a 1982 Corolla is 4x4.5
1982