if i was you,what i'm gonna do is put some bleeders in the bottom of themwhen it starts raining if it rains much just opne them and let it drain out.if you gotta go somewhere and don''t feel like closing them,just leave them open,it aint gonna hurt.i also thought about just drillin a little 1/8"hole and not even pluggin it.i don't think any smoke would come out.

 

it will smoke a little out the 1/8 hole my buddies got that problem. but who cares its a truck right?

 

i'll probably go with a little screw in valve

 

i know this thread is kinda old, but does anyone have measurements for mounting cab lights on a 2nd gen? it mentions about 5" back... is there markings in the roof when you pull the head liner?

 

When you pull the headliner off, it will be pretty obvious where they should go. I just drilled up through the roof. Worked well for me on mine and my buddy's truck.