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Troubleshoot Trailer Wiring - Left Signal and Brake Lights Not Working

This is a practical approach to troubleshoot any electrical wiring problem with a trailer. The diagnostics start with an inspection of the tow vehicle's electrical system. A diagnostic tool is reviewed and fuses are checked. A multi-meter is used to check DC voltage. Our boat is used in saltwater and corrosion issues on wiring connectors are addressed. Try and check simple issues first like a bad light bulb. Don't rely on a visual inspection of the bulb. Install a bulb that you know is working. There should be no reason that you would have to pierce the insulation on one of the trailer wires. If you do, it will have the potential of allowing corrosion to form. Seal the hole with some type of sealant. Electrical tape will not be sufficient to prevent corrosion over time.