You have installed trailer wiring harness # C59496 correctly on your 1989 Ford Bronco II. The red wire should be grounded along with the white wire. Make sure the ground location is a clean, bare metal surface.
Brown is for running lights, yellow will be for the combined left turn/brake light wire on the vehicle and green is for right turn/brake lights.
If it still isn't working, then you can test it to see if there is a problem with the converter box using a circuit tester such as #... view full answer...
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