I recently installed some Pacer Cab lights in my 2001 Chevy. All went good with the install and everything, but shortly after the install I noticed my center bar is getting moisture intrusion. The outer single lights are good.

I'm wondering what everyone that did this installation or ever had this problem did to cure it, or have any suggestions.
Thanks
Brandon

Sorry to be daft but not sure where you brought the wires into the cab the (light bar). If it is the roof then hummmmm? If you came into through the firewall or floor , this will fix the problem. The best fix is what they call a Myres hub it has an o-ring that seals waterout next would be a sealing ring they both come in 1/2" trade conduit ( pipe) size and electrical whole salers have them or some electrical supply places have them as well. If the hole is in the roof then try to find a produce called Sika Flex it is a marine product that will seal water out make sure that you have the two wires apart when you put it on them and the light bar???? Good luck water is always best out there.

http://www.buyautotruckaccessories.com/product.cfm/cf-bin/pn.pacer-late-chevy-cab-roof-led-light-kit/
They are these kind of lights, 20-240S, same as factory only smoked. I brought the power for the lights up the passenger windshield pillar, then across the roof, then thru the hole, grommeted into the cab light, the same way as I did the others. The center has moisture intrusion, and nothing else. Power didnt come from outside of the cab, in, then out again.

Any thoughts or cures are welcome. Thanks
Brandon

I ran a bead of clear caulk around the base of mine. Also a good idea to put a drop or two into the screw holes before you tighten them down. On my first set there were also two small plastic bumps on the base of the center lense that wouldn't let the black base seal good around the lense. Cut them off and the base and lense seal better.

I used clear silicon from Autozone. Put some in the screw holes and on the screws so it would seal the heads too. Also ran a bead around the bottom of the lights too. No leaks so far - knock on wood!

I just installed my cab lights and felt no extra sealing was necessary, The rubber grommets beneath the screws seem secure as does the padding beneath the light unit itself. These are the GM NBS lights so maybe they are different but we've had 24hours of rain so far and it's set to continue for another 48hrs so this is a good test.

I have silicone sealant and will add around the screws if I see any leaks but I'm not anticipating any and that will make life much easier/cleaner come LED replacement time.

ran a small bead of silicone around the edge of the center on then stuck it down and tightened it up. No issues for me now.

While all these suggestions are great, I don't think they are hitting on what he is asking. I could be wrong...but when I read it....

Your center light fixture has moisture in the lens correct? Not coming into the cab?

If they are new and not cracked I would say run a bead of silicone around the rubber where the lens seats on to it, and a small dab on/in the outer holes where the screws go through the lens.

If I'm reading this wrong then ignore it...;)

Yea, I'm not getting water intrusion into the cab. Just into the lenses. So I guess that means my seal to cab is good, but the seal to lens, not so much? So try some clear silicone from the lens to rubber seal, and around the base of the attaching hardware??? Sounds like plan.