have a charging problem.
Have replaced battery and alternator but check charging system light still comes on. Is it possible the starter could be the problem
Is Your battery being charged at idle at around 14 volts? If not You might wanna check Your wiring between the battery and the alternator and also Your dashboard light. The battery positive and the power from the alternator will form two positives and only this will make the light go off. It seems to me You might have a broken wire between the alternator and the light,or perhaps a poor connection in the wiring circuit.
One crazy solution for charging problem has been to disconnect the radio of all things but it worked! Simple enough to try. Good luck
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