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Old 03-13-2023, 02:55 PM   #1
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trailer hitch wiring harness troubleshooting

I've purchased a cover and cargo net to protect my mountain bikes while transporting them on my rear rack. Then I realized my tail lights would be hidden, so I bought a kit to add lights, and next discovered the pre-existing trailer brake-light extension plug is not working.

I've never pulled a trailer or tried plugging in auxiliary tail lights on my 2001 E250 before, so I just discovered this now. I'm not confident that resolving this is within my skillset, but willing to try. How do I proceed to diagnose and repair this issue?
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Old 03-13-2023, 09:12 PM   #2
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Factory trailer wiring? That is fused separately in the Power Distribution Box under the hood. It’s the 3 mini fuses in the corner. They’re only 10 or 15 amps, so any bad wiring on a trailer will trip those.
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Old 03-14-2023, 05:50 AM   #3
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Quote:
Originally Posted by carringb View Post
Factory trailer wiring? That is fused separately in the Power Distribution Box under the hood. Its the 3 mini fuses in the corner. Theyre only 10 or 15 amps, so any bad wiring on a trailer will trip those.
Slightly off the OP's post but do you know what the part number is for the factory 7-way wiring harness that runs down the frame rail?
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