The alternator may not be charging the battery. Jump start it, and use a volt meter at the battery, red lead to positive and black to neg. The meter should read between 13 and almost 15 volts, any lower than 13 volts, the alternator is no good. (this is done with vehicle running).
Sounds like the battery is dead now but it may have a bad alt causing the lights to be dim when driving try to jump start and check voltage at battery while running should be around 14 volt if not replace alt
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