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Old 06-07-2016, 05:22 PM
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Given the stated facts - 12v on the battery and no volts at the jump terminals under the hood (bonnet) - the only credible theory is that something is wrong with your battery isolator, despite the appearance that its ok. Or there really is a break in the main cable (very unlikely).

Checking the input and output on the battery isolator switch next time the fault occurs will be very telling...
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