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Just in case I would check that the alternator really is charging, and within its limits. Take a VOM and measure across the battery with ign off. This should show 12 volts approx. Then start the engine an repeat. If the alt is within specs your meter should show 13,5-14,5 volts. If not either something is broke or loose.
You mentioned that you broke a tab at the alt. This might be the rectifier bridge tab. I did this on our Legacy and I had to take the alt apart and get a new bridge. If the bridge is fixable do it directly as otherwise you will permantely ruin that very expensive alt.
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