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?

Your Answer:

Ford F-150 Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealersTM


Related Models For Sale

Used Chevrolet Silverado 1500
90 Great Deals out of 14,560 listings starting at $3,995
Used GMC Sierra 1500
65 Great Deals out of 12,460 listings starting at $3,900
Used Ford F-250 Super Duty
20 Great Deals out of 1,034 listings starting at $779
Used Ram 1500
248 Great Deals out of 28,708 listings starting at $7,888
Used Toyota Tundra
25 Great Deals out of 925 listings starting at $4,498
Used Toyota Tacoma
32 Great Deals out of 1,401 listings starting at $7,900
Used Ford Mustang
61 Great Deals out of 1,884 listings starting at $3,995
Used Ford F-350 Super Duty
21 Great Deals out of 2,004 listings starting at $9,900
Used Chevrolet Silverado 2500HD
14 Great Deals out of 1,511 listings starting at $4,995
Used Chevrolet Colorado
15 Great Deals out of 2,201 listings starting at $1,600
Used Nissan Titan
33 Great Deals out of 1,102 listings starting at $5,917
Used Chevrolet Tahoe
20 Great Deals out of 1,086 listings starting at $4,900

Used Cars for Sale

2019 Ford F-150 For Sale
7 Great Deals out of 8,490 listings starting at $1,000
2018 Ford F-150 For Sale
17 Great Deals out of 951 listings starting at $21,900
2017 Ford F-150 For Sale
7 Great Deals out of 622 listings starting at $24,511
2016 Ford F-150 For Sale
18 Great Deals out of 845 listings starting at $17,995
2015 Ford F-150 For Sale
11 Great Deals out of 390 listings starting at $2,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.