Don't care for the voltage drop on the standard isolator I have... Anyone have any experience with HellRoaring's non diode battery isolation system?

I have one. I installed it about 4 yrs ago now so I don't remember exactly how I hooked it up. I did set it up so that 1 battery is used for starting engine and other battery runs all accessories.

I did get the toggle switch and installed on dash.

I can't comment how much better than a regular isolator set up because I have not had one. Just the regular 2 battery and 1 battery selctor switch. I had no problems in the past, but having so many people in the area having dead batteries seemingly all the time, I did not feel like having any myself.

BTW: They do have excellent instructions and tech support if needed.

What brand are you using? I have a spare Professional Mariner if you would be interested in it.

The drop should not be an issue, if the isolater is hooked up properly the voltage sense is at the battery after the isolator so you'll see proper voltage at the battery. Haven't tried the others yet but will have to take a look at them.

My main concern with what I have now is that my volt guage and gps both report a consistant 11.2 volts.

At the same time that I added the isolator, I added a new one wire alternator. Maybe it's this combo that's causing the 11V condition. Everything seems to be functioning fine, I just don't like seeing that low a voltage on the guages.