Trailer Lights Not Working with 7-Way Trailer Connector on a Toyota Landcruiser  

Question:

Expert Reply:

Since the trailer lights work fine when being towed by other vehicles, the problem is clearly with the vehicle. I would recommend you use a Circuit Tester, item # PTW2993, to test the trailer connector on the Land Cruiser. Test the lighting pins on the connector as each lighting function is activated.

Do you know if the trailer connector on the Land Cruiser is factory or aftermarket? If it is factory installed, there should be fuses on the vehicle that manage the towing circuits. One of these fuses could be blown. The vehicle owner's manual should offer more information regarding the specific location of these fuses.

If the connector is aftermarket, there should be a taillight converter, like the small box you see on the part # HM48925 that you mentioned. Find this box by tracing the wiring back from the trailer connector and use the circuit tester to test the wires entering and exiting the converter box.

If there is a signal going in, but not out, the converter has gone bad and must be replaced. If you need to replace the converter, the part number HM48925 that you mentioned would work fine. If the 7-Way connector is more than several years old, and is showing some corrosion on it, it might be a good idea to replace it as well.

We offer a 4 to 7-way adapter, part # 37185, that the converter would plug right into, requiring no cutting or splicing. We have a video that outlines the complete procedure for troubleshooting your trailer connector, I will include a link to the video which can be found below.

expert reply by: Mike L

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