Cab leak

The Warden

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Hello!

There's a water leak into the cab of my truck. I'm not sure where the water's coming in from, but the water comes out of the top rear of the cab (behind the metal trim piece that holds the rear part of the headliner in). This leak didn't present itself until late in the rainy season last year, but I've been so busy that I haven't had a chance to even think about it until now.

The headliner's removed; that's how I noticed it. There's a hole right under the cargo light (I think someone cut it out to run wires to a camper the truck briefly had before I got it), but this hole's been there far longer than the leak has...in fact, the cargo light was missing when I got the truck and there was just a hole there, and I never had water get into the cab from there before. I did recently replace the cab clearance lights, but I was under the impression that any water leaking from the clearance lights would go down the windshield area, not the back of the truck.

Do you guys think that water from the cab clearance lights could get to the rear of the cab? Or, where should I be looking? I know the hole at the cargo light needs to be repaired, but again, I don't think that this is causing this specific problem, since I haven't had this leak before even with the hole being present. Perhaps I should seal up the cab lights anyways; what's the best way to go about this while still being able to remove the assemblies to replace bulbs when they fail?

Thanks!
 

TLBREWER

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The new cab lights should have had a closed cell foam "gasket" under them to seal them to the cab. The closed cell should not absorb water, but if they were a cheaper made repro they may not have the correct sealing material. Just my .02.

I don't know how, but could your rear window seal be causing your dillema? I wouldn't thinks so because it is lower than the inside of the cab, but you never know.

Tom
 

MIDNIGHT RIDER

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My vote is cab-lights.

I sealed under my new ones with RTV-Black---the truck is black.
 

towcat

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tim-
couple of suggestions if you are going to seal off your cab lights.
1) take a moment and buy some type194 LED replacements. the chances of them failing are alot less than standard bulbs.
2) use the proper sealant if you are going to do so. 3M "super77" weatherstrip sealant is designed for bonding to rubber and metal(and your skin and all over your clothes too if you're messy). the common term for the stuff is "gorilla snot" since the original stuff came in yellow. It also comes in black too.
just my .02
 

The Warden

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The new cab lights should have had a closed cell foam "gasket" under them to seal them to the cab. The closed cell should not absorb water, but if they were a cheaper made repro they may not have the correct sealing material. Just my .02.

Good point, Tom. I forgot to mention that the replacement cab lights are NOT new. They were sourced from various trucks that no longer exist (more to the point, they were in towcat's shop and he didn't need them anymore :angel: ). I tried to use the five foam gaskets that were in the best shape, but they were all questionable. I should probably seal up the lights first and go from there.

tim-
couple of suggestions if you are going to seal off your cab lights.
1) take a moment and buy some type194 LED replacements. the chances of them failing are alot less than standard bulbs.

I've been meaning to do exactly that. I actually intend to replace all my lights with LED's, to reduce the system load as well as longevity. Problem is, I can't remember where to get them. I had a website that had good quality bulbs, but can't remember for the life of me what the URL is (and, the bookmark's on my other comp :rolleyes: ). Where are you getting yours from?

2) use the proper sealant if you are going to do so. 3M "super77" weatherstrip sealant is designed for bonding to rubber and metal(and your skin and all over your clothes too if you're messy). the common term for the stuff is "gorilla snot" since the original stuff came in yellow. It also comes in black too.
just my .02
NIIIICE!! Two questions regardign this stuff. First, where is it available? I don't recall ever seeing it at an auto parts store, but maybe I missed it. Second, is it physically possible to remove once it's set, or will I essentially be permanently bonding the lenses to the cab? It would be nice to remove the lenses if I have to (although, obviously I'd need to re-seal them if I did so)

Thanks again! :cool It's been a while since I looked at the cab roof of my truck (heck, it's been nearly 3 weeks since I've even seen the poor thing), but IIRC there's sort of an inner shelf that goes all around the edge of the roof on the inside, that wires can be tucked in, etc. and that water could pool in. I think there's a small opening in the shelf in the right rear corner (a factory opening; no idea what it was intendef for), and I think that's where the water's coming out. If there's no other exit point, it would make perfect sense for the water to be coming in the front and migrating back before going out.

I just hope there isn't any cancer damage...I wonder where else the water could have gone (down an A-pillar, maybe?)...
 

MIDNIGHT RIDER

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At least on my cab, there are electrical items on both front, and rear, of the overhead, i.e. cab-lights, and interior lights, plus the wires/plugs for cargo-light, and make-up mirrors, not used on my cab.

All these wires are fed up and over from behind the driver seat.
 

The Warden

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I'm guessing you have a regular cab?

On my truck, those wires come up the driver's side A-pillar (and I ran my CB power, antenna, and PA wires up the passenger's side A-pillar) and branch off from there...

I didn't even know make-up mirrors were an option on our trucks LOL
 

f-two-fiddy

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A dried up windshield seal will give you the same problem. Spray a garden hose up under the trim, without getting any on the cab marker lights. If it leaks, there's your problem.
 

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