Mercedes light relay This listing is for a nice w126 /123 light relay. It's in very good working condition. Just plug it right in. This relay should also fit a variety of older mercedes cars, w123, w124, etc. Check your part number. Common issues this may cause would be an inop defroster, or one that comes on and shuts off way before it's been running long enough to defrost. Thanks for looking! Part number is 005 545 33 32 / 898446