My understanding is a lot of Jews voted for Reagan in 1980 due to unhappiness with Jimmy Carter's foreign policy but then returned to the Democrats in 1984. I'll verify that to be sure.
I watched the 1980 Election Season/Night coverage on CBS and NBC, uploaded to YouTube. I can't remember which network mentioned it, but according to them, Reagan did about the same with Jewish voters as Ford, while virtually all of the Jewish voters which Carter lost went to John Anderson. The coverage doesn't provide much detail about what it was exactly with Carter's Israel policies that upset Jewish voters (possibly state recognition issues?), but they highlight Carter's efforts to defend his policies and to win back defectors. Obviously, these did not work, and Carter's poor performance among Jews is one of the major factors as to why he lost New York to Reagan.
