Troubleshooting 12 Volt Accessory Circuit Not Active on 2018 Ford F-150  

Question:

Expert Reply:

A lot of times the 12 volt accessory circuit isn't active on vehicles for the trailer wiring. Sometimes it's just a matter of inserting or replacing a fuse under the hood of the vehicle. Or in other times a relay has to be installed.

We've found that the easiest way to bypass all of that is to use 10 gauge wire like part # 10-1-1 to run from the vehicle's positive battery post through a breaker like part # 9510 to the 1:00 pin of the 7-way.

expert reply by: Jameson C

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