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Old 02-02-2019, 09:28 PM   #1
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Wiring From Under MH Into Basement

I'm adding some additional 12v switches to my mh for some accessories and need to pull power from my house batteries into one of the basement compartments. What's the best way to pass thru the basement wall and keep water out of the basement? I will have 1 power supply wire from the 12v disconnect relay to power the fused switches and possibly multiple wires (from multiple accessories) that need to go thru the basement. Is there a good way to do this with 1 passthru or should I do multiple?

I've got the electrical part figured out, just need a passthru into the basement that want leak. I plan to do the passthru at the top of the compartment to keep the wiring out of the way of the stuff stored in the basement.
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Old 02-02-2019, 10:33 PM   #2
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One thing comes to mind, use rubber eyelets. I used these when drilling through my firewall to lead wires into the cab. They serve two functions. One is to prevent chaffing of the wire against the basement wall, thus preventing a cut wire. The other is a water tight seal. The other item I have used is "foam in a can." This was also used by the MFG when they ran wires from my basement to the house. Hope this helps.
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Old 02-02-2019, 10:52 PM   #3
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Drill hole as high as possible use rubber grommets to protect the wire and use some black rtv for sealing the penetration and forget it.
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Old 02-03-2019, 07:42 AM   #4
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Thanks for the input so far. I was thinking of using grommet and wire loom thru the opening. Hadn't thought of using spray foam.
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Old 02-03-2019, 08:35 AM   #5
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Silicone can be used instead of the spray foam too. A bit cleaner, and you don't need to open a whole can of spray foam for a quick shot.
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Old 02-03-2019, 08:41 AM   #6
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I have used squares of Eternabond tape to seal holes such as you describe, Works great
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Old 02-03-2019, 09:49 AM   #7
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Quote:
Originally Posted by Kxbronco View Post
I was thinking of using grommet and wire loom thru the opening. Hadn't thought of using spray foam.
Yep. I've installed several new wires in, around and under chassis and that's exactly what I did. Drill hole, insert rubber grommet, put wire loom around wires, push wires thru grommet. Once everything is wired up, I then secured the wiring on both sides of the grommet with a screw fastener and added a drip loop JIC.

Then finally sealed both sides of the grommet where the loom went thru with clear exterior window & door silicone.
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Old 02-04-2019, 12:11 PM   #8
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Quote:
Originally Posted by marjoa View Post
Yep. I've installed several new wires in, around and under chassis and that's exactly what I did. Drill hole, insert rubber grommet, put wire loom around wires, push wires thru grommet. Once everything is wired up, I then secured the wiring on both sides of the grommet with a screw fastener and added a drip loop JIC.

Then finally sealed both sides of the grommet where the loom went thru with clear exterior window & door silicone.
same as I do, since I hate spray foam lol
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Old 02-05-2019, 11:47 AM   #9
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I would not put a split or spiral loom through the grommet, but rather on each side of it. The loom itself can serve as a migration path for water. The grommet will serve as both your chafe protection and water stop. Silicone is also a poor choice for sealant. It has little strength and mold loves to grow on it. Two products I won't keep on the coach are silicone and duct tape. There are better performing products to replace both - albeit slightly more expensive.
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Old 02-10-2019, 08:09 PM   #10
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Interesting that I find this thread. I'm planning to mount my solar controller in the basement and wanted access to run wires when I need for my portable panels (not roof mount).

I was just at Lowes today and decided to buy a 1.25" sink drain, the kind used on a bathroom sink. It is threaded and uses rubber washers to create a water tight seal on the basement compartment wall. I'm using a rubber sink plug to plug it when the solar is not in use.

I'm thinking of putting the drain in the floor instead of the wall, so that if I also store muddy shoes, etc. I can wash out with water pretty easily.

It's an idea.
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Old 02-10-2019, 08:26 PM   #11
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Something like https://www.ebay.com/itm/64-67-Pontiac-GTO-Lemans-Accessory-Wiring-Pass-through-Firewall-Grommet-Plug-ST1/181585225945?hash=item2a4752a8d9:g:jiUAAOSwEBpaoY1 ~:rk:11f:0

or https://www.ebay.com/itm/OE-BMW-E39-...!-1:rk:24:pf:0

would be waterproof, and cost a lot less than a marine -grade bulkhead grommet. This would also protect the wiring from eventual chaffing and shorting out the battery.
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Old 02-11-2019, 05:38 AM   #12
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Originally Posted by tragusa3 View Post
Interesting that I find this thread. I'm planning to mount my solar controller in the basement and wanted access to run wires when I need for my portable panels (not roof mount).

I was just at Lowes today and decided to buy a 1.25" sink drain, the kind used on a bathroom sink. It is threaded and uses rubber washers to create a water tight seal on the basement compartment wall. I'm using a rubber sink plug to plug it when the solar is not in use.

I'm thinking of putting the drain in the floor instead of the wall, so that if I also store muddy shoes, etc. I can wash out with water pretty easily.

It's an idea.
Are you thinking of putting a pan down for the basement floor to facilitate the wash out too? Even with a drain, don't think it's good to put regular water on the floor. Corrosion and Mold are the concerns.
Yes, I did power wash out the basement of the MA when I rebuilt it that one major time. Just won't do that on a regular basis.
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Old 02-11-2019, 05:51 AM   #13
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That particular basement compartment has no carpet, it is just plastic. I was thinking I would finish the cleanup by passing a dry towel, getting 100% of the moisture up.
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Old 02-15-2019, 08:47 PM   #14
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Thought I had posted this over a week ago, but the holes are drilled up high and the grommets are in place. Waiting on my switch to come in and then I will pull the wire, install the switch, and seal up the grommets.

Thanks for all the input. It is much appreciated.
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