Blue Sea Systems - Battery Switch ON/Off AFD

Quality switch

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Used this and a pile of 4G cables to create a house bank and engine bank on my boat. Works good.

Missing nut :(

This was a direct replacement for my previous - and working properly - Blue Sea 1-2-Both-Off switch common to many boats. It's much simplified, and was recommended - even though my existing switch was fine - by the marine electrician who surveyed our boat's setup during our replacement of our massive battery bank. It fit exactly where my previous switch had been. There are two studs for each battery; ordinarily you'd just leave it in the '1' position; the other shows as 'emergency start' on their instruction page, but it merely puts both batteries on the same circuit. The charging circuit from your alternator is always live to the second battery; turning the switch to the yellow-labeled position bridges the charging and discharge lines for the two batteries. Likewise, of course, the '1' position also has continuity all the time between whatever charging sources you may have, and whatever destination your power will arrive in; they show a panel icon to indicate that arrival point. Very simple, and the usual robust quality you expect from Blue Sea products.

Quality Item, but expensive for what it is. Bolts require 10mm Cable Lugs for attachment.

Nearly perfect. Switch feels solid, and is perfect for a master disconnect for my Jeep's winch. The winch's electrical ring terminal wasn't quite large enough to fit on this these big lugs, so I had to drill it out slightly. Works great. I do wish it had a detachable cover for the back, to protect from shorting to nearby metal on a vehicle, but if you mount it securely, this is not a big concern.