Will the oil light brake light and battery light go off when i replace the alternator

sounds like either your battery is not good or your alternator is weak.

Bad recharge tension,must see with voltmeter by battery,mostlikely bad alternator bridge/brushes.Rare:alternator belt slip,can be asociated with motor over heating (because of the water pump shared belt).Brake light must track the problem,can be stucked float on the pump oil cap,worn brake pads (if it have the sensor,easily identify by wire near the pads),bad hand brake switch.

If it can be determined that the oil leak caused the alt. to fail prematurely it should be replaced at no cost to you.If it is obvious and there is alot of oil on the alt.I would file it under the warranty.

When you replaced the battery, did you have the alternator tested? The battery light indicates either the battery is not holding a charge or not receiving the proper power from the alternator to charge the battery.
The brake lights could be a glitch but it could also mean that you are low on brake fluid or you have air in the brake system. Suggest you at least check the fluid level in the master cylinder and bleed the brakes.

check brake light bulbs for fault/washer check water level in bottle/alternator faulty

The incorrect battery was installed , the alternator is defective or the wiring connected to the alternator and battery cables are defective (corrosion and looseness)

Have the alternator checked for out put voltage,at the battery,while engine is running.It should be 13.65,to 14.25 volts.anything less,or over,is not acceptable.If the alternator is over charging,then it will drag the engine r p m down.If the battery light is coming on,at all,there is a problem in the charging system.

Replace the alternator,and clean the battery cable ends real shiny,no grey,or black film left on the cable ends that connect to the battery.Alternator does not have enough power to run the ignition and all it`s assesories.

Check if you drop oil on the alternator on this model because it falls and oil will damage the alternator verificata it first

there is a short somewhere. faulty battery or faulty alternator.