Section 16 (Engine Starting System & Charging System): Generator: Disassembly
WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
Remove the cover.
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Remove the terminal B.
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Remove the rear cover.
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Remove the brush holder.
NOTE:
Set the socket with suitable size etc. (a) to the brush holder, and slide the brush holder toward the socket etc. (a) to remove so that the brush does not pop out.