One section will be always hot and the other switched off with the ignition, you'll need a volt meter to check. Remember the fuses have two sides, one will be the hot side and the other not. To test for 'off' with the ignition you have to wait about 5 minutes for the circuit to time out. Some cars even longer.
Mike
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2018 M5 and 2019 Porsche Boxster GTS
Prior. '94 325is, '97 M3 Lux, '16 M2
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