If testing with a trailer, mate the 4-flat with the trailer and run the same test as the circuit tester using the trailer lights. If a function on the trailer lights does not work properly, disconnect the trailer 4-flat, turn functions on the vehicle off and recheck function with a circuit tester. If functionality is good, check the trailer for potential problems. The short circuit, overload.. To verify proper installation once installed, test by connecting a test light or properly wired trailer. Warning: -This video is intended to be used as reference.
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Trailer Wiring Connectors Various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller, backup lights, or a 12V power supply for a winch or interior trailer lights.. The following are some of the different automotive electrical systems used in vehicles today. When towing, your trailer's wiring system needs to be connected to your vehicle's wiring system. This requires a plug and socket, as well as a taillight converter in many cases.
![[DIAGRAM] Optronics Trailer Light Wiring Diagram](https://d114hh0cykhyb0.cloudfront.net/images/specs/truck/trailer-wiring-harness-edit1.jpg "[DIAGRAM] Optronics Trailer Light Wiring Diagram")
