I assume this is what you are refering to. Lifted from elsewhere.
mattstevenson
Hi mate, I have the very same problem, what year is your rangie? If it's a pre 2006 have your had the 2006 facelift done, mine had it done before I got it and the drain has turned out to be the headlight ecus not going to sleep for some reason. The temporary way round the issue is to drop the cover off the diagnostic port I.e leave the port uncovered, this drops the powr to the headlight ecus and there fore removes the drain on the car. If you have a multimeter you can simply find the drain your self.
If you want to know how to use the multimeter to find the drain let me know.
Matt
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