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Scoot

Guest isolator switch

Question

Scoot

I've got an isolator switch between two batteries in my boat. Apparently it was installed incorrectly or it isn't working, because it's not isolating anything (current runs both ways between the batteries).

Where can I find the info I need to get it set up correctly? I Googled for "guest isolator switch", but can't find what I need.

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bbqhead

try google with battery isolator, should be a bunch.

randy aka bbqhead

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Scoot

Yes, there is a bunch. But what I need is an online manual to set up a Guest Isolator switch (or something that'll tell me how to do it). Where can I find that online?

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Capt. Don*

Is what you have an isolator or just the orange battery switch that has positions for battery 1-2-both and off?

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waskawood

I am guessing that it is like any single pole double throw switch. You have a common that would go to the generator and two outputs, one goes to each battery that you want to charge. Take an ohm meter and you will have continuity across 2 terminals. Turn the switch to the other position and you will loose continuity between the two original terminals but you will have continuity between the third terminal and one of the two first terminals. That original terminal that has continuity between both terminals depending on switch position is common or generator. It is hard to type this so I hope it isn't clear as mud. Hope it helps.

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Whoaru99

I assume you've checked the Guest website? Guest is a sub-brand of Marinco.

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Scoot

I checked their website- didn't find anything helpful.

The one I have looks just like this:

10827.gif

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waskawood

I don't believe that is a switch. It is an isolator. There should be one terminal that goes to the generator and the others go to the batteries. There is a diode that prevents the reverse flow of electricty so that your starting battery does not draw down. The terminals must have some kind of markings. Don't guess there has to be some kind of identification.

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Whoaru99

I'd think one should be able to determine the correct connection by the terminal markings. Are there any markings by the terminals?

If all else fails, just call them and ask for help.

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marine_man

Scoot - I'd take an ohmmeter to determine the connection.. I'm completely guessing, but does the middle one connect to the alternator (or, in this case, a jumper from your starting battery to this isolator box) and one on the side to the other battery?

Since you only have two batteries I'm wondering if you need the two battery one... you pretty much have to connect the motor's battery cables to the battery, and then run a jumper from the battery to the isolator box alternator post.

Just a guess...

marine_man

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Scoot

Thanks fellas. I'm going to call the dealer and get it stright from the "horse's mouth" when I have it right in front of me.

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