WHAT IS THE DIFFERENCE BETWEEN 3157 STANDARD SOCKET AND 3157CK SOCKET?
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First question might be, why doesn’t it matter with incandescent or halogen bulbs? Reason is because an incandescent or halogen bulb light up using a coiled wire and does not matter what wire is on the positive or negative side as long as there is at least one positive and one negative and one coiled wire. There is not polarity sensitive operation with incandescent or halogen bulbs. This only applies to LED and HIDs.
Polarity sensitive represents the idea that product in hand (LED, HID, Capacitor, etc) can only be connected in one way to work properly. Positive to positive - negative to negative. IF you connected them incorrectly (negative to positive, etc) then they will not operate or damage the item. LED bulbs that are 3157 and are connected into 3157CK socket will damage the 3157 LED bulb. So this is why it is important to connect a 3157CK LED only bulb into the 3157CK wire socket. Please see the image below.