Disconnect the red and black wires from the negative post. Install a knife switch on the post, and reinstall the red and black wires on the other knife switch terminal. Don't know who installed your cables, but it's wrong to have a red wire to a negative post, and note the red wire to positive post is retaped as black. Makes no sense, but as long as they're working, I'd just do the knife switch.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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