Trailer Lights Only Work When Door is Open on 2011 F-150
Updated 05/20/2019 | Published 05/18/2019
Question:
When I hook up my trailer the tail lights on the trailer only work when I open the door. I have a 2011 Ford F150 Lariat 4x4. Strange.
asked by: Gerald C
Expert Reply:
You must be somehow tied into the illumination circuit on what I assume is a factory harness on your 2011 Ford F-150. What you should do is start by testing your harness with Multimeter # PT89ZR to see if it is getting 12 volts when the door is open, which will verify that it is indeed tied into that circuit. Since it is a factory harness you are going to need to go to your local Ford dealer to have them examine exactly how this issue came to be, as this is a first and strange is certainly an appropriate word for it.
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