Mysterious Plug

[JOKER M1]

Just an fyi if anyone finds one of these. Best I can find it’s a dust/pin protector cover for a wire harness that goes through the door or fire wall.

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[2BigPups]

Just an fyi if anyone finds one of these, found mine in the engine compartment. Best I can find it’s a dust/pin protector cover for a wire harness that goes through the door or fire wall. It can be discarded but hell I’m gonna keep mine, might make a nice parts holder, I paid for it.

I will probably post this in the main S550 thread as well

It is used to cap the end of a wiring harness. After the wire harness is installed they are discarded. Protects the pins from getting bent during installation and assembly.