On the Mercedes-Benz W213 E-Class (2017–2023), the power distribution network has evolved past the older F32 prefuse boxes found on the W204 and W212. Power delivery is heavily decentralized using pyrotechnic disconnect modules and high-amperage internal blocks.
If your W213 has sudden, massive electrical dropouts or refuses to crank, the issue usually stems from one of two main high-amperage "prefuse" systems: