My 2003 MDX had been sitting for a couple of months and wouldn't turn over after a 20 minute jump. So I replaced the battery. Still wouldn't start but got some noise. I did a long jump and it almost turned over. I tried a few more times but then I saw some whitish smoke rising out of the from of the engine near the front. I couldn't quite locate the where. Is the most likely cause the alternator? Thanks in advance!