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sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 23115
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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2 weeks ago my r rear signal and brake light quit working.

Customer Question

2 weeks ago my r rear signal and brake light quit working. changed the bulb and still not working. the next week, the r rear was now working and the l rear is not working. it goes in and out on its own while signaling. any suggestions ? 2008 F350 Super Duty XLT 4x4
Submitted: 2 years ago.
Category: Ford
Customer: replied 2 years ago.
I should add that I checked all the fuses and they are good.
Expert:  sprinkles08 replied 2 years ago.

Hello and welcome to JustAnswer!

If the bulbs are good and you don't see any corrosion or burning on the socket or connector terminals then you either have a module or wiring issue. The turn signals and brake lamps are controlled by the mart junction block. It's possible that the failure is within the module but it's more likely to be wiring. You may have losing power or you could be losing ground, left and right use separate grounds so a lost ground will only affect one side.

Have you tested for power and ground while the lights weren't working to determine which was missing?

Customer: replied 2 years ago.
I have not. I will try the hot and ground tomorrow.
Expert:  sprinkles08 replied 2 years ago.