OK, when you push the switches in by hand you should go from zero resistance to infinite resistance on your meter. pressing the switches in should stop the motor,
if not the switch is faulty. Again, have you checked the end of the switches, they break off very easily and it is easy to miss. I very much doubt it will be the relay.
Look at the attached diagram, (thanks to workaholic) you can see that the switch has to make to send the power to the motor.
One of your switches is faulty