Are these good to maintain 12v+ on a second battery?...Any pros or cons will be appreciated.
Good suggestion. Friend had a boat with the battery selector that would only provide power when set on "1" or "all"....no power on the #2 setting. I was told that on the "all" setting, the batteries would never get a full charge...and the only way the bilge pump would work was if he turned it on...or set the toggle switch to auto. Several years later, a mechanic advised the selector switch was defective. It was replaced and the bilge wired direct to the battery so it would come on when needed without having to remember to set the toggle switch to auto.builge pump float is wired directly to the battery w/fuse protection