To be fair it’s rather a throwback to ICE vehicles. If the negative lead of the radio is connected to the battery then, should the engine earth strap fail (not unheard of) then all of the starting current can find its way back to the battery through the radio chassis.
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There will be a nice big grommet where the loom goes through the bulkhead so I would suggest using that.
Just as a point to note and apologies if this is teaching you to suck eggs, a fused connection to the battery +ve is fine but make sure to connect the negative lead directly to the...
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