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Old 07 December 2007, 06:19   #1
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Blue Sea Isolator

I have one of these fitted to my boat its a 1 or 2 or both type.

When in off, the battery + terminals become common. Is this correct? I'd have thought you'd have got complete battery isolation.

The reson I ask is because one of my batteries is dead and the other is OK and I know for a fact I have isolated the batteries after each outing.
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Old 07 December 2007, 06:58   #2
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Ok just checked a bit more thoroughly and found what's in the attached photo. A resistance across terminals 1 and 2 of 105 Ohms, this is clearly discharging battery number 1.

Is this normal or a fault with the Isolator switch? Have I got my wiring right?

Andy
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Old 07 December 2007, 07:05   #3
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Oh, hold on a min, the resisance is comming from the batteries

I hate electronics and electrical work.....

But why would one battery be flat, I've only ever run the boat on the Both setting Interestingly it's the larger capacity battery thats dead.

Any suggestions anyone, this has got a JW feel about it
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Old 07 December 2007, 07:25   #4
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You called sir?

If you've definately always run on the two batteries and you're sure your wiring is fine, nackered battery comes to mind.
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Old 07 December 2007, 07:29   #5
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Well I'm charging it up right now. I guess time will tell.

Andy
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Old 07 December 2007, 07:33   #6
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Quote:
Originally Posted by Hightower View Post
I have one of these fitted to my boat its a 1 or 2 or both type.

When in off, the battery + terminals become common. Is this correct? I'd have thought you'd have got complete battery isolation.
Dunno about your switch but mine is; off - 1- Both - 2 - off as the large knob turns. It is the output connection which turns and it's wide enough to bridge 2 contacts so it first rotates to connect with contact 1 then it bridges both 1 & 2 and finally it connects with contact 2 and then back to contacting with nothing so it's off.
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Old 07 December 2007, 07:44   #7
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Dunno about that Jeff, is all hidden under plastic.

However it does however seem like the battery is nackered, I get the required voltage from the terminals, but even the charger doesn't want to know

That means I must have been running my boat on the smaller 85Ah one. More expense.
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Old 07 December 2007, 07:57   #8
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Connect your meter across the terminals and leave it connected. If the battery is in the boat, switch it into circuit on its own and turn the start key to crank the engine. Read the meter as you do this.

If its not at the boat, connect something with a highish load, a head lamp or whatever else you might have that'll draw a few amps, watch the voltage on the meter. It should drop a bit but not too much.

Do you have an 'always on' circuit for, say, your VHF or bilge pump. If so, which battery does it connect to?

If you've got a modern automatic battery charger, it may be that it can't get going if the battery is completely flat. One of mine is like this and it can be started by connecting a good battery also. When the charging starts you can then disconnect the good battery.
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Old 07 December 2007, 09:15   #9
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My charger has all kinds of buttons on the front panel, if you turn it to manual you should be able to get enough charge into a completely flat battery and then after an hour switch to auto.

I think the batteries had it, I'll remove and make some checks in the garage later. BTW the negative battery terminal is turning a bit about 1/4 turn)
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Old 07 December 2007, 09:21   #10
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BTW the negative battery terminal is turning a bit about 1/4 turn)
Oops.
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