The fuses to that point in the slow speed relay should get power from the main battery junction block, its the 3 pole block with studs near the battery and the alternator also connects to it. The high speed one gets it from the interior connector behind the knee panel.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)