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Battery isolater

For all things Electrical.

Moderator: -Scott-

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Battery isolater

Post by Aj6474 »

Hi there people I am fitting a battery isolater and am not sure whether to isolate the positive or negative cable can some one please help me
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Re: Battery isolater

Post by Shadow »

isolate the positive.
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Re: Battery isolater

Post by ledgend80 »

most cars i guess would isolate the positive but alot of our machines at work that run alot of computer equipment we isolate the negative side
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Re: Battery isolater

Post by -Scott- »

Without drawing a diagram to check, I suspect that if you isolate the negative, you'll need to wire all accessories direct to the "isolated" battery - using the chassis as a return path will effectively bypass the isolator. So, if you do this, I guess you would want to isolate your main battery, and then everything else (including standard vehicle accessories, like lights?) should drain the aux battery. I think.
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Re: Battery isolater

Post by stuee »

Would it not depend on whether the vehicle is positive or negative earth??
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Re: Battery isolater

Post by -Scott- »

stuee wrote:Would it not depend on whether the vehicle is positive or negative earth??
Well, yes, I was presuming a negative earth.
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