Determine break in long circuit
You will have to test the output of each switches in reference with the ground, and starting by the first switch. If your voltmeter reads 0, it means the switch is open.

Prepare some cables you can carry around, connect one side to ground (or zero volt) and the other to your voltmeter common.



Example:

You measure the output of sw1, it's ok. Then you measure the output of sw2 and you figure out it's zero. So you close sw2.

    sw1    sw2    sw3    sw4    sw5
VCC-o=o----o/o----o=o----o o----o=o-
      +24     0


And going on like this you should find the good position for all switch in one pass.

    sw1    sw2    sw3    sw4    sw5
VCC-o=o----o=o----o=o----o/o----o=o-
      +24    +24    +24     0