I just bought a mag light 14 3/ in. big. and i have no idea what order the batteries go in. i need help?

Question

takes D batteries

Answer 1

The positive end (the one with the nub on it) goes in first for each one.  The last battery's negative end (the flat one) should be against the spring on the end cap that is screwed on.

Answer 2

Put them all in one direction, if it doesn't work, try them in the other direction. Maybe the directions that came with it may say...