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Battery Disconnect


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We store our trailer 1.5 hr from our house in a barn that has no electricity.  I check on the trailer every 2-3 weeks when we are not traveling with it. The parasitic drain was concerning. I built a battery cutoff switch to easily disconnect the batteries during storage. My build consisted of a Harbor Freight switch, Harbor freight terminals, a plastic electrical box, 18" of 4# wire, a couple grommets and some command strips to hold the box in position. We currently only have 2 batteries so the switch box mounts easily behind them. I may want to rig up something nicer later but this is fitting the bill so far for $20.  Build time was about an hour including crimping and soldering the terminals.



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It is nice to have a large spot on the tray to mount things, but I caution you not to rely on Command Strips for critical stuff like wiring. You need a strap or some screws with nuts underneath. You don’t want that box to pop loose and start flopping around.....

Do you know what the amp rating is for your cutoff switch? I could not find any specs on the Harbor Freight website. If you decide to upgrade in the future, the marine grade Blue Seas units cannot be beat. You can get locking versions.

John Davies

Spokane WA

SOLD 07/23 "Mouse":  2017 Legacy Elite II Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/

Tow Vehicle: 2013 Land Cruiser 200, 32” LT tires, airbags, Safari snorkel, Maggiolina Grand Tour 360 Carbon RTT.

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