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My fiat failed the MOT today as my 3rd break light has stopped working, however I got told that if I disconnect it altogether it will pass on my next MOT check
 

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Wire harness connecting the hatch to the main body issue. Engineering defect. Check those wires to make sure that the insulation around each wire has not become brittle and cracked causing the short or failure of purpose. Sorry.
 

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Welcome to the forum. Check the light bulb first. See if it burnt out. If it’s not that. Your wiring harness, has broken to the rear hatch. Common issue on 500’s
There are replacement wiring harness patch’s available.


Hand Automotive lighting Finger Terrestrial plant Feather
 

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It happened to my pop. Isolate all the wires and give them one twisting of electrical tape each. Did the trick to mine and that was four years ago. Good luck
 
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