That is a good question. It was in the car when I bought it in 9/12. I'll go to Advance tomorrow and have them test it and the alternator.
I got in touch with my mechanic friend. He said there were several harnesses in that general vicinity and that I may have disconntected something. It is also making a funny whooshing noise as the engine starts. I drove it tonight to see if tthe lights cycle off - no go. I don't want to drive it too much while getting false temp readings.