In an earlier post you said that you don't have a tune. I would suggest you get one asap.
14.6 when idling is actually a good thing, so no worries there.
In terms of the lights, check the output of the alternator at idle, it should be 14 - 14.5V ( I think ). I think that there is another thread in here concerning the SR alternators not charging at idle ( or something like that ).
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