AP ji go with OBV you will come to know when the retracement ends and uptrend begins or if at all the retracement becomes a reversal. Volumes donot lie and it cannot be created from thin air. It takes real money to be reflected. Just posting a chart of Bajaj Finance (Yes you may call it hindsight but nevertheless it is a beautiful chart. Whenever the OBV has come above the green line from below (The lines provided by Happy Ji ), it has given an opportunity to add.
The 2 green lines are the 15period highs and lows of OBV. And the turquoise line in Price pane is the 36EMA.