Larsinger58:
5. As far as Ahaziah of Judah "becoming king" in both the 11th and 12th years of Jehoram of Israel, note this does not represent a "Nisan-based" vs. "Tishri-based" rulership assignment, though that was a reasonable way to try to harmonize this reference. In actuality, when the Bible mentions a person "became king," it can either be a reference to their co-rulership or their sole rulership. That's why you have the mention of the same person becoming king twice, years apart. Case in point Jehoram of Israel. He becomes king once in the 18th of Jehoshaphat (2 Kings 3:1) and again in the 5th year of Jehoram of Judah!! (2 Kings 8:16). Jehoram of Judah, of course, did not become king until the 2nd year of Jehoram of Israel. That simply means that king Ahab also died in the 5th year of Jehoram of Judah, the time when Jehoram "became king" a second time, in his own 6th year, after a 6-year co-rulership (out of 12) with his father Ahab.
As with his other claims, there are various problem here.
Firstly, despite what is 'suggested' by Lars above, my chart already properly accounts for the coregencies of both Jehoram (of Judah) and Jehoram (of Israel).
Secondly, he claims I am mistaken about the Nisan- and Tishri-based reckonings for Ahaziah's reign, but after waffling on about the two Jehorams, he doesn't actually say anything about where he would otherwise place the reign of Ahaziah.
Thirdly, there isn't an alternative for placing a second starting point for the reign of Ahaziah, as it comes between the reigns of Ahab and Jehoram, which already accounts for the the period of Jehoram's co-regency with Ahab, which followed Ahaziah's own co-regency with Ahab.