Torchlight LEDs in series, is this possible?
I guess you are using that classic yellow chinese multimeter. The diode setting is used for testing circuit continuity, i.e., to check whether there are any breaks in the circuit. They are also used to test whether leds are working or not and display the resistance of the closed circuit. This is all. But I need you to edit your question and post pictures of your flashlight, pics of the circuit, pics of the circuit conection with the battery and pics of the leds. Then I am going to design the required circuit for you. Also tell me what kind of batteries did the torchlights use (what was the voltage rating?)