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• ankur

  Member Since: 12 Apr 2024

  Location: Chester

  Posts: 14

   

  

  Parasitic drain how to

  Hi,
  
  I installed a new battery in My Discovery 5 HSE 2 years ago. Last Friday the battery was dead and i couldn't even unlock the car. Last Thursday the car ran perfectly fine.
  
  I think there's a parasitic drain somewhere in the car, and I'm wondering if anyone has any ideas on how to perform a test on all the fuses in these cars. The issue i see is that I need to lock the car, and leave the car 15mins for all the modules to go to sleep. However, how do i then get into the car to check the fuse boxes without waking the modules up?
  
  I guess i will need to trick the car into thinking the doors are closed by closing the door latch?
  
  Thanks!
  Ankur
  
  Post #42867 11th May 2026 9:33 am

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• ankur

  Member Since: 12 Apr 2024

  Location: Chester

  Posts: 14

   

  

  I was pretty fortunate so far to have found a relay which was warm to the touch when i unlocked the door, all the others were cold. I verified that the relay was indeed not opening the circuit and was in a closed state with a multi-meter first then with a 9v battery. I still want to run a check once i have a new battery to see if the current draw is still too much, with an amp clamp.
  
  Post #42888 12th May 2026 10:02 am

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