Mukhi, the diagram doesn't show and you do not say how many wires you have - I expect there to be four of them.
Number them 1-2-3 & 4 -use little stickers.
Take 1 & 2 and attach them to the battery pack
If the clock runs then 3& 4 should go to the speaker.
If not...
Take 1 & 3 and connect to the battery pack - see what happens
Take 1& 4
Then 2& 3
Then 2&4
Then 3&4
At the end of this process on pair of wires will be making the clock rum - when you know which two work the clock mechanism the other two will be for the speaker - just concentrate on the clock - ignore the speaker until you have the clock running.
Good luck...
August 2015