We haven't run into this in the past with customers who have used the # 118710 so I would start by checking the vehicle side connector. The brake and turn signals are separate on your European style 7-way so you will need to determine which pin is the brake signal and check for power using a tester like the # PTW2993. It may be that there is some corrosion on the connector as well, especially since it is a 2002, so it would be a good idea to check it and clean as necessary.
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