Those are the error lights that show on the MR2 when either the alternator is giving no charge, or when it is overcharging. An alternator can fail in both ways, and it sounds exactly like what you describe - improper charging.
How do u know the alternator is charging correctly, u should read 14 volts at the battery when the cars running to know its charging. try wd40 on ur electrical connectors in the engine bay, this will drive any moisture out of the connectors and hopefully correct ur problem.
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