Upgrade your BMW turn signal relay with our 3-pin relay combo! By replacing the stock 4-pin relay with a common and more affordable 3-pin relay, you can avoid the headache of searching for an obsolete part and get the replacement locally for much less than a stock one. Our video tutorial shows you how to easily implement this relay upgrade. This combo is commonly used on the following BMW models: e12, early E21, E28, 2.5CS-3.0CSL, early E24, 2500-3.3Li, and early E23. 4DB003425-00 https://youtu.be/AQA02lH56y0