door light strip lighting

[carmel120]

Hi im just wondering if anybody has the same trouble as my car the ambient door card strip lighting has a problem on two doors when I change the optic light strip it only goes for about 1 day then goes out again these are used ones that I am using it is annoying in the dark nights now lol.
And what voltage would I see at the optic strip light side so I can check with a meter.

cheers trev