Trailing 2-0 to Dom Heaume and Fraser Maginnis goals at the break, Wayne Bishop gave Belgraves a lifeline with a fine finish just before the hour mark and the champions were forced into a defensive rearguard for much of the remaining half hour.
Belgraves welcomed back a string of players from injury and suspension and were much more like the side that started the season so well.
Saints have now gone 27 league games without defeat.
