Water leak onto fuse box

550Doug · Dec 4, 2016

While checking out why the blower fan on my 2009 Enclave was intermittent on low speeds I discovered water had been leaking onto a fuse panel. The plastic box that the bundle of connectors sat in was full of water. I disconnected and dropped down the bundle of connectors from the bottom of the fuse box, emptied the water out and got a hair drier to get everything dry. The leak appears to have come from the windshield area on the passenger side, or possibly from the sunroof drain tube also in the same area. The water was dripping onto one or two relays on the upper side of the fuse box, then made it's way through to the bottom side with all the connectors.
So everything is now dry and reconnected but ZERO power anywhere. It acts like the battery has been removed, but I didn't touch it and I verified that it is indeed fully charged. Is there a type of main fuse that could have blown?
Thanks for any ideas what to look at next.

centash · Dec 4, 2016

Might be full of corrosion....and needs replacing. Ben

retired farmer · Dec 4, 2016

Try spraying it with some electric contact cleaner. Probably got corrosion in it from all the water.

Steve@Advance · Dec 4, 2016

When water gets into something like that, it will cause electrolysis to eat away at the connections that are under power. Look for green corroded wires and connections, especially on the underside of the terminal block that the relays plug into.

Also, if the battery was connected while you were working on it, there may be a main fuse or fuse link burned out. Look under the hood, near the battery. There is probably a fuse block with several large amperage fuses. Check them, be sure there is power to the main fuse block from the battery.

Janicholson · Dec 4, 2016

Wiring diagrams are probably on the net, but reading them is intimidating to say the least. Tracing the power into the box
is the only way to do it. a simple test light will work. But knowing what should be powered and what should be off is
important. Jim

MARK ROBKE · Dec 4, 2016

I will 2nd looking for corroded connections first.The water will either tarnish or corrode,causing no connection even tho it is plugged in.Mark

Water leak onto fuse box

550Doug

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centash

Well-known Member

retired farmer

Well-known Member

Steve@Advance

Well-known Member

Janicholson

Well-known Member

MARK ROBKE

Well-known Member

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