Just noticed it yesterday and am curious if anyone has had this happen so it may help me narrow down where to look...

I have water dripping off the passenger grab handle on the A-pillar when it rains. Does this sound like a windshield leak or a cab light leak, or a ???

Any ideas? I plan to pull off the a-pillar trim over there and hose it down real good.

 

I'd put money on it being your windshield seal. Those things dry up and get brittle over time. Not likely to be the cab lights. It's a tiny hole and the water would disperse across entire roof panel first