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Well basically just sealing up anywhere water can get in and wreak havoc. So if you put RTV on the undersides of the connectors where the wires go in, or if you wanted to do it cleaner somehow. But being behind the oil cooler and that close to the ground, I'd just be concerned with water getting in there.
The relay box that is mounted to the crossmember in the front of the engine bay, when I installed my VMIC I just hung that relay box upside down. One night it rained really bad and I went through a lot of water and it killed the car until it dried out. I'm still not entirely sure how it got in there other than running down the hood and through the cracks, but that wouldn't explain the deeper water I went through. Either way, I took a heat gun and dried it out and it was fine the next day. I've had problems getting water in my headlight relays too and they pop up and down until it dries out. That's pretty embarrassing lol.
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