The gray electrical box on the firewall is a feed through capacitor. It's used as a noise filter on the original charging system. Leave it installed if you are using the original system and remove it if updating with another system.
Web
What is “original” and what is “updated”? Generator vs alternator? I have that box too and always wondered if I really needed it. My plane originally came with a smaller alternator, but somewhere since was upgraded to 60A alternator....not via STC, but just using DOFF10300 as in IPC of later Cessna’s.
Chris
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