Electrical problem - battery was reversed

Car: Dodge, Neon, 2000 - Back to Fix-It - Dodge Repair Manuals

Q.I have a 2000 Dodge Neon. The battery on my car had been drained by my car alarm which I mistakenly set when I took off for 6 months.
My friends replaced the battery with the wrong kind of battery (the terminals were reversed), and they didn't pay attention when they hooked it up.
I was told that something sparked, smoke came out of the engine and after that it was shut off. I have replaced the battery with a brand new one and got the car running again. However, when I turn on the car, after no longer than a minute, the battery light on my dash comes on and won't turn off until I turn the car off.
Also, outside of the headlights, dashboard lights, hazards and other lights necessary to run the car, nothing else electrically runs in my car.
I've replaced the battery, I've changed the spark plugs, I put in a brand new alternator and nothing seems to be working. I got it tested at a mechanic and the machine they used said that the battery passed the test, but the alternator and starter failed. The alternator is new, but the starter is not yet. I don't know what to do to get this light to go away and get my car running 100% again.

I already checked/done: new battery, new alternator, new spark plugs.

Answer Do you have charging voltage when the light comes on? This should be about 14.7volts. Its possible that when wires were crossed damaged occurred to the Powertrain control module field driver circuit. This can be tested with a scan tool to force the PCM to actuate the generator field.
You must also make sure you have (ASD) voltage to the generator when engine is running. Here is a wiring diagram for you charging system.

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Electrical problem - battery was reversed