Redbridge went ahead after three minutes when a speculative lob which looked destined for the side-netting crept in the top corner.
The goal gave Redbridge the confidence they needed and they could have gone further ahead on a few occasions just afterwards but it remained 1-0 to the hosts at half-time.
After "a very frank half-time team meeting" the Scrabble boys rallied and centre-back Ben Cantopher equalised on 60 minutes with a close-range header.
This served to spark Scrabble into life for a 15-minute spell and Scrabble had a few one-on-one chances with the Redbridge keeper which were squandered.
Scrabble were made to pay two minutes from time when Scrabble failed to clear a corner and Redbridge popped up with their late winner.
Disappointed Scrabble manager Ray Abrahams told JC Sport: "All teams get these weeks when things just don't happen as you would hope and expect.
"We just weren't on our game today and all credit to Redbridge who clearly wanted it more than us and we got punished with two very soft goals against us.
"We just didn't perform at anywhere near the level we have been and we are capable of much better and the boys know that. They've let themselves and the club down today with this performance.
"We were simply not good enough in many areas and got what we deserved from the game...nothing..
"Next weeks game now becomes massive for us against Faithfold as we have the opportunity to bounce back from this defeat against the league leaders and I will be looking for an immediate reaction from the players in that game."