2001 jeep grand cherokee laredo dome (interior) lights wont turn on when i open

the drivers door? when i open the door the lights wont turn on but when i close and re open it they turn on fine?
if its the open door switch how do i get to it?
could this be from a weak battery?
my battery gauge says its fine but my turn signals work about 50/50 and this
im in the process of replacing the turn signal relay
 
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