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have a load test done on the battery to check for internal failure. remove the battery earth wire and fit an amp meter in the line to see what amps are flowing when everything is switched off. It could be a faulty diode in the alternator, boot/ glove box light staying on, interior light on or a faulty relay or module./ As to the scanner not reading the ECM records , there are several different leads that are in use for different vehicles so make sure that the correct sequence is being used to get readings.
some times the door switch can be faulty. and it may be coincidence that the interior switch is faulty too. i have owned alot of S- series trucks and a few of them have done this to me. you need to individually check each door for switch contact