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I went to for a new radio into my corsa c 55 reg. it blew! Also my 12v cigarette lighter is pushing 26.6v on a voltmeter. Should it be this high or is there an issue somewhere
 

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Corsa C 2004 z10xep
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Faulty regulator on alternator. That voltage will cook electrics. Fire risk at that voltage. Should only be 14 volts 14.05 volts max. Only reason if voltage is that high is alternator. You not had it changed and put a 24v lorry alternator in have you?
 
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