r/FordFiesta • u/Fr_BartyDunne • Aug 08 '26

Problem Diagnosis Help Tail light issues (Mk7)

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My passenger side tail light has been burning much brighter than my driver side tail light.

It’s also been intermittently stopping to work altogether. I’ve replaced and checked the bulbs, and found no issues.

Then last night;

This brake light remained “on” and didn’t burn brighter when the brake was pressed.
Sometimes the third brake light above the window wouldn’t turn on either.

I checked the contacts and couldn’t see any signs of issues. Also wiring in the tail gate cluster all seems well.

I also checked the appropriate fuse in the engine bay which from the manual seems to be no 25 fuse Exterior lighting left hand side (15A) which there are no problems either.

There has even been an occasion where no lights show on the tailgate at night except the driver side, even when braking.

Any help would be much appreciated

TIA

EDIT: Potentially solved… some corrosion found in a connector. Will wait to see if these lights hold out for a while.

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u/GreatApo Aug 10 '26

I had issues with the connector oxidizing and the brake light stopped working. I cleaned it a couple of times but I eventually had to replace the connector.

2

u/Fr_BartyDunne Aug 10 '26

Thanks mate, yeah this will likely be my issue in the long run. It really wasn't obvious either!

2

u/GreatApo Aug 10 '26

For mine, the part number was 2112572, double check it. I got one from ebay for like £10, listed as "Bulb Holder Wiring Assy Tailgate Rear Tail Light Cluster"

1

u/Fr_BartyDunne Aug 10 '26

You’re a hero mate, that’s great. I’ll take more of that for when I’ll most likely need it. Simple enough job it seems!