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CantRepeat 06-21-2014 01:08 PM

Switching to a VSR from the factory isolator?
Anyone switch over to a Blue Sea VSR from the factory isolator?

Did MC switch to VSRs in 08?

CantRepeat 06-22-2014 06:44 AM

Well I'll let you know how it goes.

bturner2 06-22-2014 07:36 AM

I installed the "add a battery" kit about 4 years ago. Still working well. Very happy with it.

CantRepeat 06-22-2014 11:23 AM


After reading the Xstar wiring pdf that a member was nice enough to share, I noticed there were some changes in 07, and 08-14. Mainly the change from isolators to VSRs and moving the bilge pumps and radio memory wire to direct feeds that work even with the battery switch in the off position.

I'm not too concerned about the memory in the radio. But, since we started camping I've been leaving the boat in the water overnight unattended. In my 06, with the switch in the off position the bilge pumps get no power and I don't like that idea. So I figured I'd get off the isolator, factory guest isolator look a little weathered, and get onto the new VSR and new style switch.

CantRepeat 07-19-2014 03:09 PM

So I finished up my trim tab gauge move and it is raining today. So, figured I'd use the time to finish up my isolator to VSR install.

The only real change, other then the VSR and new switch, was moving the alternator wire from the isolator to one of the batteries.

The switch is different in that my old one was an off,1,2,both and the new on is just an off, on and it does have an emergency combine.

First thing I did was draw up a wiring schematic. I read a lot of stuff about duel batteries with a VSR and it seems a little less confusing then an isolator. That fact comes from how many different ways people install isolators. The only real issue with VSRs is which battery to run the alternator wire to. The two major thoughts were keeping the starter battery fully charge by attaching the alternator wire to the starter battery. The other school of thought was, the house battery gets used more so you should attach the alternator wire to the house battery.

The conclusion I came to is that it really doesn't matter when using the Blue Sea SI-VSR. That's because as long as your alternator is putting out 13.7 volts the circuit is closed and both batteries are being charged. The nice thing about this VSR is that it can vary the charge to either battery by it's need. IE, it can send 7 volts to each battery or, if, one battery only needs 4 volts it can send 10 volts to the other. Some of the other VSRs that I read about cap out at a voltage level.

The other thing I did with this was take out the 1/2 king star board and make a new panel out of 3/4 inch star board. The old panel had a ton of old holes and I wanted to back mount the new switch for a cleaner look. Besides, I had the better part of an 4'x8' sheet from another project.

Anyway on with the show. I hope it will help others.

My diagram: I intend on adding the starting circuit wire, its just not in the schematic.

Mock up of the panel.

Wire routing check:

In the end I went from this mess:

To this:

The VSR and all the circuit breakers are on the back of the panel now.

deminimis 11-22-2018 04:09 PM

Old post, but thanks! My orig isolator finally gave up the ghost. This will be helpful.

deminimis 04-03-2019 03:11 PM

Tim, it's getting time to start thinking about ordering up parts to fix my '04 Guest setup. It's been a few years. Happy with the results? Thanks!

xienaeristarcraft 04-03-2019 09:12 PM

I just added the SI-ACR from blueseas to my 06 xstar. I liked the options it has for start isolation and the remote LED. I agree, I plan on modifying the radio memory and at least one bilge pump to be hot regardless of the switch.

I opted for a 1+2+both switch just because I like to switch back and forth between batteries for equal use (they are both duel purpose). If I do want to hang out and run the radio on one battery, I can always switch to the other which will run the start and the electronics such as fuel pump, ecu, dbw, ect. Only letting the engine start on the one battery is half way there if the other electronics need power too. Of course, as long as they can run on the depleted battery for 30 seconds, the VSR is performing as it should, and the battery is not below the low voltage lockout everything should be fine... Perhaps I just like to be in control a little instead of a complete set it and forget it...

besides the switch, our setups look very similar. Are you planning to use the remote LED? I ran the wire but have not decided where to drill my dash just yet...

deminimis 04-04-2019 12:52 PM

I actually think I'll save the hassle and just order the 120A version isolator:

CantRepeat 04-30-2021 04:54 PM

I had a couple of PMs asking about the images that were in this thread.

They were hosted on image dump or something like that. I'll see if I still have them and if so edit the post an reinsert them over the weekend.

Sorry, guys, been a little busy around the garage lately. :D

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