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Parasitic drain on 2003 Suburban 2500 LT 4x4

  

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Please help. If truck is left for 2 days the battery voltage drops to ~5.9 volts.  Truck has 230000 miles. LS 6.0 engine with no mods.  Changed drivers side switch module (OEM), BCM, with no change.  BCM was changed due to power door locks cycling.  Replaced drivers side switch module due to passenger door window not working.  Replaced passenger side door motor, no success. Need a success path.  Love the old truck 


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https://www.youtube.com/watch?v=lRcj1fQcWwU


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