. The main bulb number is 3157. These two contacts are the common negative (-) grounds. Note: The 7443 led bulb will function in either 7443 or 7440 sockets. One of these two contacts is the common negative (-) ground. The 7443 extra contacts don’t connect to anything in the 7440 socket and the bulb will light high beam only. 7443. Close competition for the 3157 model is the USA-designed 7443 Switchback LED Bulb. Use care when bending the leads and only bend one time to avoid breaking them off. You can swap the wires to the socket to match the diagrams We will rundown the basics of each bulb to determine what makes them unique from one another. LED switchbacks are a great way to give your car a modern and unique look. One for bright  or high beam (braking/turn signals) and one for dim or low beam (running/parking lights). Bulbs Led Premium Red, White, Ambar 3157, 7443, 1157 and T divine. The 7443 led bulb can be used universally in either 7443 or 7440 applications. The 3156 has two separate wire contacts protruding from the bottom. Note: The diameter of the 7443 bulb is: 0.79in / 20mm. What benefits does a built-in resistor offer? If you examine the bulb closely, you can see that two of the wire contacts connect to the same point inside the bulb. The dual contacts are connected to 2 separate circuits inside the bulb. For … "CK" bulb in a socket that is wired for a conventionally wired 3157 The bulbs of this model are bigger in size than the average. Whichever bulb you decide on, you can’t go wrong! Translated. mode. LED switchbacks are LED bulbs that are white 6000K when in parking or running light mode and then flash amber when the turn signals are activated. circuit is for bright  or high beam (braking/turn signals) and one for dim or low beam (running/parking . If you examine the bulb closely, you can see that two of the wire contacts connect to the same point inside the bulb. These LED car bulbs come in a wide variety of types, such as 3157, 1157, 7443, 1156, ba9s, 7440, 7443, 194, 921, and third-generation LED headlights with H7, H11, H4, H8, 9005, 9006, and 9012 bases. Maximize your vehicle’s performance even further without experiencing hyper-flashing or worrisome (and frustrating) error codes, again thanks to the built-in resistor. From aircraft to marine ships, it was used with complete faith. Together, these advanced design features work to enhance the overall effectiveness of your vehicle’s LED output and long-lasting performance. If not sure which 2 leads are the positive leads, just  bend all leads around to the opposite sides. This model is easily installed and features 1200 lumens per bulb. They are well able to convert 95% of their energy. Underground Lighting offers you the best and most extensive collection of H11 headlights . The 3156 is a single contact (s.c.) bulb. Are 7443 and 3157 bulbs interchangeable? Make sure that you get the best headlights possible for your ride by reviewing the information below. The 7440 is a single contact (s.c.) bulb. This will ensure that the high beam circuit connects to the high beam contact on the bulb. There is P21W and P21/5W and P21/4W and PY21W and PR21W, etc; these all have round metal bayonet bases and none of them are interchangeable among themselves or with either of the others you mentioned. In the 7440 socket, the 7443 will have extra contacts that are not connected to anything. The dual contacts are connected to 2 separate circuits inside the bulb. In a very few vehicles, the low and high + Positive leads on the 7443 will need to be bent to the opposite sides so that the bulb will light on the brighter high beam circuit in the 7440 application. Headlights are one such part. The 7443 is a Japanese-spec lamp found in many Hondas, Acuras, and Mazdas. Yes, both 3057 and 3157 have Wedge D.F. Bayonet Tail-Brake Turn Signal Back-Up, Tail Brake Turn Back-Up Reverse Light 1156 1157 1142 2357 7507 7225 Bayonet Bulbs, LED Bulbs 3157 3156 3457 4157 3057 Tail Brake Turn Back-Up DRL Reverse Light, Xenon HID Bulbs 3157 3156 3457 4157 3057 Tail Brake Turn Back-Up DRL Reverse Light, Chrome Xenon Bulbs 3157 3156 3457 4157 3057 Tail Brake Turn Back-Up DRL Reverse Light, Switchback Two Color LED Bulbs 3157 3156 3457 4157 3057 Tail Brake Turn Back-Up DRL Reverse Light, Canbus Led Bulbs 3157 3156 3457 4157 3057 Tail Brake Turn Back-Up DRL Reverse Light, See All Bulbs 3157 3156 3457 4157 3057 Tail Brake Turn Back-Up DRL Reverse Light, Tail Brake Turn Back-Up Reverse Light 7444 7443 7440 Wedge Bulbs, License Plate Side Marker Coutesy Map Interior 194 168 161 2825 W5W Miniature Wedge Bulbs, Instrument Panel 37 74 2721 T5 Sub Miniature Wedge Bulbs, Instrument Panel 24 T6.5 Miniature Wedge Bulbs, Instrument Panel Ba7s Midget Flange Bulbs, Dome Trunk License Plate Map Courtesy Vanity 3022 212 578 6418 6411 Festoon Bulbs, Ba9s E10 Screw Ba7s Bax9s B6 G18 B19 Small-Head Ba15s Bay15d Bayonet Bulbs, Upper 3rd Brake Map Trunk 579 906 921 T15 Medium Wedge Bulbs, 6 Volt - Antique - Vintage - 24 Volt Bulbs, Boat & Marine 1142 1076 1176 Bayonet Bulbs, Dura Chrome Titanium Platinum Silver Vision Stealth Bulbs, Canbus Error Free BMW Mercedes Audi VW Volvo Dodge 5002S PY24W Bulbs, Daytime Running Light (DRL) Kits & Foglight Systems, LED Screw Mount & Motorcycle Indicator-Accent-Running Lights, LED Light Tubes, Neon Light Tubes & Underbody Lights, LED Windshield Washer & Mirror Turn Signal Indicators, Angel Eye Halo Rings for Headlights, Tail Lights and Lenses, LED Strips, Led Strings, Led Bars & Control Modules, Overhead & Under Cabinet Lighting - Truck, Boat & RV, LED Light Fixtures for the Home, Boat & RV, LED Bike, Go Ped, Motorcycle, ATV, Boat and RV Light Fixtures, LED Screw Mount Indicator & Accent Lights, Semi, Truck, 4X4 & Truck Trailer Leds & Lights, Household Commercial & Industrial Lighting, Pop Up Recptacle Floor Mounted Electrical Boxes, Windshield Wipers, Tools & Automotive Accessories, LED Flashers, LED Protectors, Load Equalizers Turn Signal Fix, Electrical Contacts, Sockets, Connectors & Fuses, Led Controllers, Flashing Modules, Braker Modules & Dimmers, Programmable Remote Controllers & Switches for Garage Openers, Discrete Raw Leds, Resistors & Components, Power Inverters - Power Supplies - Power Adapters, Switchback Bulbs Two-Color Turn Signal-Running Light Bulbs, Motorcycle & RV Running Lights, Turn Signals and Indicator Lights, Vinyl Protective Film for Tinting Windows, Headlights, Tail Lights & Lenses, Black Box Dash Mount Digital Video Recorders. 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