2001 Lexus rx300 - Just replaced the Battery and Alternator because my dash went out and I couldn't start my vehicle. once replaced it starts but still no dash, no heat, no windows, no locks. I need to release the shift lock in order to drive. Eventually the vehicle will turn off due to battery drain. I checked for parasitic drain. could my alternator be shot even with out using it??
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Then remove fuses and add them one at a time while monitoring the current draw. You do have to wait 5 mins or so for things to go to sleep. You can disconnect the alternator to see if the alternator is draining out the battery.
Leave the heavy hitters out and drive out (if possible) to have the battery and charging system checked out.
Then start tracing what is contributing to the large current demand. Once the current drain is fixed you can start tracing the open (no voltage) to dash etc.
Please search the thread on parasitic draw (250-350 ma) is my memory serves me right.