Check the national electrical code. See the link below.
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The wire code for lights can typically be found in the electrical wiring diagram that corresponds to the specific lighting system. The wire code is a reference to the color-coding used for the electrical wires in the system, indicating which wire performs which function. If you are unable to locate the wire code, consulting an electrician or the manufacturer's documentation for the lighting system may provide the necessary information.
The ground wire for trailer lights is typically white.
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The wire that lights up inside the globe is the filament.
Check the fuses related to the tail lights in the fuse box. If the fuses are good, inspect the wiring for any breaks or damage. It is also possible that the switch or relay that controls the tail lights may be faulty and needs to be replaced.
For three 12 volt lights, you can typically use 16-gauge wire. However, it's always a good idea to consult the manufacturer's specifications for your lights to ensure you are using the correct gauge wire for your specific setup.