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2007 CRV AWD
2,221 Posts
Back in the 20th century, mid 1900's and later, tubes were the prevalent technology.
The filaments would burn out in one of the tubes.
But, smacking the unit would sometimes get it to work
Why?? Cause the shock would make the filament make contact
and the electric current would keep it together, making contact.
Or the pins holding the tube was loose and the shock would make it work.

So, I believe the bulbs did burn out and work after they were burnt out.
It is just the way the bulbs were made.
Of course, today's tech with semi-conductors don't have this.
Still, you will find older techs troubleshoot by hitting the unit being tested.
My motto use to be if it don't work then hit it. :ROFLMAO::p
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