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Q: Car won't start after replacing alternator... on 1998 BMW 323i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i Have a BMW 323iC. I had a guy replace the alternator (it was dead & had been draining the battery previous to it finally dying). The alternator now works, the starter seems fine, everything engine-wise seems fine...but the car will not start. The BATTERY LIGHT is on, the OIL light is on & the EXCLAMATION MARK (inside sort of a circle) is on.

What could be the problem? Please help!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Battery?
The alternator does not assist in the starting of a vehicle, only provides power to electrical system and charges battery during engine operation.
If the alternator was indeed failing, the battery would have been completely depleted of energy as the alternator could not output to keep the engine/vehicle electrics running.
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