I had originally suspected the wiper pivot seals, but before I could replace them I had the problem again. There is water puddling on the inside of the windshield gasket, and the only way I can figure that it got there is from the windshield.
10-4 Agreed
Get up under with a flashlight.
My old body resembles an upside down FAT pretzel when I do this!! LOL
Go in on your back from the pass side and check up to your wiper arm pivots or remove glove box and take a look.
I show doing this on our restore thread Titled; "ABodyBetty's NEW Baby comes home" 1975 Dart.
Check it out. We pull the windshields out on that car, rehab the gasket, install new pivot clamps, the works!8)