Join Date: Jul 2017
Location: Cape Coral FL
Vehicle: 2005 SLK55 AMG
Other Toys: too many things to take care of and use properly
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I have seen bulbs break the filament from vibration, start working again with a sharp rap to the housing that causes the filament to touch and then resistance heat sticks the two halves together until the next hard rap separates them again. Currently have a bulb on our Vacuum doing this exact thing that I do not care to fix. That bulb stays on, flashes, stays off depending on the walls you bump into.
Had this problem on a trail bike headlight as well, too much vibration broke the filament, didn't notice until I was 20 miles from home and it was starting to get dark, fortunately, I hit the housing, it started working and made it home before it failed totally.
But then, I am certain you have replaced the bulb and still have the problem. Contacts in the plug, ground connection, and possible break in the wiring, had all these problems at one time or another. Other than company cars, for a long time the newest car I had owned was 20 years old, with years of problems stored up in them.