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Are the black and red headlight relays directly interchangable? Is one type better than the other?

My 9k has the black type (same type as in my 89 900i hatchback) so I'm curious to know more about the differences between the black and red type.

Craig.
 

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Basically the same relay, just in a different color housing with different part numbers

I have used/tested the black ones in my 1992 9000 S with no problems. It properly ran the headlights and brights.

The red ones will work in the older pre-1992 9000's.

The same goes for the Black lamp control box - then starting with the model year 1992 became the orange lamp control box.

The only problem with some of the earlier/older black ones is that the base is sealed up making it harder to get the cover off, if you need to re-solder the pins to the board.
 
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