DJ3100
Well-known member
Yeah, I checked my 2000 Chevy 2500 which has the relays and fuse panel under the hood and it's not sealed, just covered. Condensation hasn't been a problem there either - of course I almost never wash it.
I'm in the process of machining a better looking cover. I will use foam tape to seal the lid and RTV to seal the wires into the grommets, but mainly I want to keep dirt and water out. The relays are potted, so terminal corrosion is the only potential problem from condensation. There is always a terminal block in that location anyway, so I don't think there is a probability of any additional problems.
I'm in the process of machining a better looking cover. I will use foam tape to seal the lid and RTV to seal the wires into the grommets, but mainly I want to keep dirt and water out. The relays are potted, so terminal corrosion is the only potential problem from condensation. There is always a terminal block in that location anyway, so I don't think there is a probability of any additional problems.