Having not heard this song, I still agree with Peace that "black cadillac in the morning" makes much more sense than "black cadillac 'de moan" or "black cadillac in Des Moines {Iowa}".

Nobody's asked about the meaning of "black cadillac" but I'll go there anyway.

I don't think the singer's talking about a brand of car.

I bet this is an allusion to making love. In other words, "cadillac" [black or otherwise], is a phallic symbol.

Inspite of this song being sung by a male, given these words, I believe that it was composed for a woman's voice and point of view. My sense is that the woman is asking her {Black} man to come back because he has something of hers {meaning his penis}. And the woman is also saying that she likes making love in the morning.

This woman probably likes making love at other times too but 'doing the do' early in the morning when the focus is supposed to be on work and other mundane activities carries the implication that the loving is really irresistably good.

If I'm correct that this song was originally meant for a woman's voice, then it might be one of many songs that have lyrics that make
more sense from one gender's perspective though the song is performed by someone from the 'opposite' gender.


And though nobody's asked, I concur with the song's sentiments

:o)