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Engine keeps running meant that engine ECU are fully operational. So whatever happened to the rest of electrical systems did not affect engine ECU. So I would probably start with replacing all the fuses and fuse box. But because you said you already replaced all modules (I guess it includes the fuse box?), safe to assume it's not the fuses.

I would try to check and probably add grounding wire first. And also replace both battery terminal.

If that doesn't solve it maybe replace all wiring harness. Maybe a bit overkill, but you already replaced all modules anyway, why not go the extra mile?
 
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