Water sealing the firewall wire opening

[alkapin]

There is a large opening next to the brake cylinder normally covered by a plastic plug. It is great to run all your wire thru. Any advice how to water seal it once all wires are in? I was thinking a construction foam? What do you think?

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[LincolnSixAlpha]

IDK, but I'm curious as well. I'll be drilling out this plug shortly to run the ARB wiring for my fridge shortly. I was just going to throw some silicone the electrical cable as it came through, but curious any other thoughts.

 

[Tpham]

i drilled a hole and used grommets for 1/0 awg wires for amps. you can seal it with silicone as well.

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