But what exactly is wrong?

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The continuity check in the MICLIC's TM 9-1375-215-13&P does a great job telling you when you have a short in the electrical system. But it isn't very specific about where the snort is.

Here's a quick way to find what exactly is wrong:

CAUTION : The MICLIC should not be loaded during this test.

Test the M51 blasting cap set to make sure it's working. See the -13&P for the test procedure.

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Make a shunt wire from a two-in piece of commo wire. Hook the M51 blasting cap test set to the control box using the two-wire pigtailed cable. Connect the shunt to the control box's J2 connector A and B holes to test ROCKET and to the B and C holes for the CHARGE test.

Cycle the M51. If the M51 lights up for both tests, the control box is good.

Next connect the W3 cable to the control box. Do the above test for the W3's A and B and B and C holes. Set the control box selector to ROCKET for the A-B check and to CHARGE for the B-C check.

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If the W3 is good, connect the W5 cable to the W3 cable and do the same checks.

If the W5's OK, plug the open end into the safety box. Lower the launch rail and do the above A-B and B-C test on the safety box cable.

The M51 should NOT light up on either test. Raise the LAUNCH rail and do the above tests again. Now the M51 should light up. Lower the rail and plug the safety box cable into the tub's charge box and do the normal continuity test. If at any point a box or cable flunks the test, you know immediately what must be replaced. When you're finished testing, return the control box selector switch to SAFE.