This is a genuine BMW relay battery disconnection, part number 61 31 1 366 203. The number stamped on the part is 61311366203; BMW's catalog files it under the short number 1366203. You will find it on our Electrical shelf, under Switch. It supersedes the older number 1352154, so a part carrying that number is the same part. BMW has since replaced it with 1378211.
It fits the E36 sedan, coupe and touring (318i, 320i, 323i, 325i, 328i and M3, 1992–1999), with the M40, M42, M43, M44, M50 or M52 and other engines — and the European-market versions.
BMW draws it on 4 diagrams, among them Additional battery (61_0685) and Various switches (61_0786). It weighs about 140 g (0.3 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
