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I have changed the reversing lights on my E-Niro FE to LED.

With the car switched off, in park and all lights off, garaged for the night. When I start a change a contactor under the bonnet clunks and the reversing lights make one intense flash. Everything else is normal.

Could someone possibly drop an oscilloscope (sold mine a year ago!) on the reversing light socket or even just on the 12V circuit and see what is happening please? Induced current pulse? switched for a moment from the 'gear selector'? I can't account for it at all. Obviously the old incandescent bulbs managed to sink the current without visibly flashing, the flash is very fast.
 

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I was say its the system doing a lamp check, to see if any lamps are blown, its a low enough voltage not to light a filament lamp, but LEDs use can run lower voltages to operate.
 
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