60's Gospel singer Al Green had a club hit with a new song (not 'Let's Stay Together') in the early to mid 80s. It was a proper full on dance track, but I can't find it listed on any of his greatest hits CDs.
A bit of a long shot but Arthur Baker collaborated with Al Green on 'The Message Is Love'. Arthur Baker had a club hit in the mid 80s with 'Breakers Revenge' which is a full on dance track. Could this be it?