Another battery drain question

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Land Roving Ranger

New Member
Posts
2
Location
England
Range Rover - 2008
L322 3.6 TD V8 Vogue SE

The question is, for anyone that might know the quick answer; what does the thick red wire feed, if anything, other than the starter motor and alternator?

The attached diagram sums it up.

We have seen the “asleep” drain current on the black conduit bundle at the back as low as 300mA, which is borderline acceptable, but the continuous 1.0A approx drain on the red wire is the concern. If it only goes to starter / alternator it limits the possible sources of a fault, (eg alternator diode or something giving a path to earth) but if it feeds other stuff like another ECU then we won’t know, and we’re back to pulling fuses....

There was of course an initial surge (of 44A+ ) from the alternator to top up the battery, the 33A was the average settled reading.

Thank you in advance to anyone that can help :)

(DC Clamp meter and DMM )
 

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