When F O/S wheel off I cleaned up some corrosion behind a joint box. Road gravel collecting over time. Had a look on wiring drawings to check what the heavy Blue wire is, but could not locate. The nut wont come off, so cleaned up and used ACF-50.
The cover “clips” on, but lid doesn’t fit great. Fitted tie wrap. May be worth checking if you have similar poor fitting lid.
When re-fitting is used small spacer to stand off the plastic box to allow the small gravel and water to run off behind the box.
Front O/S Electrical Joint Corrosion 2017 400S
Common problem, there are threads on here about it. Yours doesn’t look as bad as some others. I put a small piece of foam at the back to prevent gravel etc getting in whilst still allowing water to escape.
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