Originally Posted by Grumpy
Check the front clearance lights too. They are also a possible leak.
Interesting you mentioned that... At the start of the season, I had a couple marker lights that were out. I went through and changed them all.
Just checked, and the curb side front top marker lens was full to the bulb level. There is a small foam gasket around the bulb, but the fact that the water was up to the bulb and not full to the top tells me it was filling up to that point, then likely running into the wall. The silicone around the base is intact, but the lens itself was, apparently, not well sealed.
So, it looks like this is my excuse to finally buy some sealed LED exterior lights and do them all.
If it was yours, would you still pull the front window, or would you try the lights first?