Couple of areas to look.
1. I've seen the actual battery connector fail or push the wires out of the plug. It'll mess you up all day, especially on the DSS's
2. Emergency Disconnect can get flaky. To test just bypass it. I've had them Ohm/Measure good and be bad with current.
3. Did you check ALL the fuses in the VM? There are some small ones as well.
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