How does a car using combined stop/tail lights wiring know whether to run the stop or tail lights? I am trying to separate these as an electronics hobby to connect to my
![How To Replace Brake Light on a Boat Trailer / How to Install Trailer Bulb / Blown Brake Light 1157 - YouTube How To Replace Brake Light on a Boat Trailer / How to Install Trailer Bulb / Blown Brake Light 1157 - YouTube](https://i.ytimg.com/vi/zv9JHbvCsaM/maxresdefault.jpg)
How To Replace Brake Light on a Boat Trailer / How to Install Trailer Bulb / Blown Brake Light 1157 - YouTube
![Amazon.com: 1156 1141 20-99 12 Volt RV Vanity led Light Bulbs BA15S 1383 1139 Replacement for 5th Wheel Camper Trailer Motorhomes Marine Boat Bathroom 30-40W Equivalent Bright White 6000K Pack of 4 : Everything Else Amazon.com: 1156 1141 20-99 12 Volt RV Vanity led Light Bulbs BA15S 1383 1139 Replacement for 5th Wheel Camper Trailer Motorhomes Marine Boat Bathroom 30-40W Equivalent Bright White 6000K Pack of 4 : Everything Else](https://m.media-amazon.com/images/I/51tvDkdG3wL._AC_UF894,1000_QL80_.jpg)
Amazon.com: 1156 1141 20-99 12 Volt RV Vanity led Light Bulbs BA15S 1383 1139 Replacement for 5th Wheel Camper Trailer Motorhomes Marine Boat Bathroom 30-40W Equivalent Bright White 6000K Pack of 4 : Everything Else
![2004 M.F.I. Trailer - replacement bulb capsule #? | JetBoaters.net - The World's Largest Jet Boat Forum! 2004 M.F.I. Trailer - replacement bulb capsule #? | JetBoaters.net - The World's Largest Jet Boat Forum!](http://ecx.images-amazon.com/images/I/61wYrFYgIEL._SX522_.jpg)
2004 M.F.I. Trailer - replacement bulb capsule #? | JetBoaters.net - The World's Largest Jet Boat Forum!
![Amazon.com: VEHICODE 1383 1139 11391f 1139if LED Bulb RV 3-Color Change Daylight White Soft Warm Natural 12V 1156 1141 1143 Interior Reading Light Lamp Replacement for Camper Trailer Boat Marine (4 Pack) : Automotive Amazon.com: VEHICODE 1383 1139 11391f 1139if LED Bulb RV 3-Color Change Daylight White Soft Warm Natural 12V 1156 1141 1143 Interior Reading Light Lamp Replacement for Camper Trailer Boat Marine (4 Pack) : Automotive](https://m.media-amazon.com/images/I/61y-2l6-XJL._AC_UF350,350_QL80_.jpg)
Amazon.com: VEHICODE 1383 1139 11391f 1139if LED Bulb RV 3-Color Change Daylight White Soft Warm Natural 12V 1156 1141 1143 Interior Reading Light Lamp Replacement for Camper Trailer Boat Marine (4 Pack) : Automotive
![Replacement # 67 Bulb for Trailer Lights, License Plate Lights, and Utility Lights - Qty 1 Redline Accessories and Parts 67 Replacement # 67 Bulb for Trailer Lights, License Plate Lights, and Utility Lights - Qty 1 Redline Accessories and Parts 67](https://images.etrailer.com/static/images/pics/6/7/67_6_1000.jpg)
Replacement # 67 Bulb for Trailer Lights, License Plate Lights, and Utility Lights - Qty 1 Redline Accessories and Parts 67
![electrical - How does a lightbulb with two filaments know which one to light up? - Motor Vehicle Maintenance & Repair Stack Exchange electrical - How does a lightbulb with two filaments know which one to light up? - Motor Vehicle Maintenance & Repair Stack Exchange](https://i.stack.imgur.com/fBEsA.jpg)