Now don't every one rush out and get one of those at once. I have owned several of those plastic battery disconnect switches over the years and have had a lot of problems with the majority of them.
The worst case was when it limited current flow to my vehicle from the battery when it was on, which could be a problem with the high amperage deuce system. I removed the switch from my jeep and all my charging and running problems went away.
The most common problem is the switch breaking and not making contact internally which leaves you dead in the water and you have to make a bypass. I would say half or more have done that to me.
They are a pain in the rear and I will not use them anymore.
I don't mean to knock the guy's work. He did a good job with a nice install I think. I would of done the same thing if I wasn't sold on those switches being crapola. Maybe a higher priced higher quality price is the way to go.