Truck bed lights turn on and off

Asked by Feb 14, 2019 at 09:48 AM about the 2016 Ford F-150

Question type: Maintenance & Repair

The truck bed lights constantly turn on and off by
themselves when engine isn't on. When the engine
is turned on they stop flashing and work normally.
Shut the engine back down and they start flashing
again. This went on for about 4 hours and now
they work perfectly fine as if there was no problem.
What could cause that?

2 Answers


You could pull the fuse in the diagram, that should stop it, short term fix. That fuse is hot all the time. There are trouble codes for bed lamp, find the code and post it. Use an obd2 code reader that will work with your vehicle, that reads po codes as well as manufacturer specific codes. The codes I saw were b1 codes. You know, short to voltage--short to ground--open circuit, those type codes. At the moment, I'm thinking ground, In the diagram, the white wire with blue tracer is ground. It either grounds through the bed lamp switch or the cargo circuit/headlamp switch or the wire itself is intermittently shorted to ground/metal service.

I stopped by the dealership and the service advisor said it is probably a bad switch. Has anyone replaced the bed-mounted switch? Is it straight forward or are there some things to watch out for?

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