My project topic is MECANUM WHEEL ROBOT
Motor M3 and M4 not working. Motor M1 and M2 works perfectly. I have changed motor driver L293d and again the problem occurs same. Motor M3 and M4 doesn't gets power supply. I'm attaching connections and code used for Arduino.

Are your motors drawing less than the source supplies? If so, what happens when you change output pins for M1 with M3? And change output pins for M2 with M4? And to be complete, can you show the working code?
@chinmayg1081171, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project.
Is this really your battery?
Read the forum guidelines to see some information on making a good post.
Include links to data sheets for the motors and shield.
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So you don't have the V2 motor shield you posted.
Maybe time to upload a real picture.
Leo..
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