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power drain from battery

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I have been working on a mates 300tdi n reg defender which is drawing power from the battery constantly thought i found the fault to be the altenator as the little wire (brown with yellow trace) is causing the problem when connected to the altenator had the altenator repaired but the little wire is still drawing 3 amps.

now i believe the little wire is going to the instrument panel my question is has anyone had this problem before and know where I should start looking many thanks

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There is a diode in series with the wire you mentioned, probably in the dash somewhere, (there was a post about this yesterday!)

Does the alternator warning light on the dash come on with the ignition off? If so it may be that this extra diode is shorted.

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