Measure key-off battery drain (parasitic draw).
Measurement should include
- using an ammeter, according to manufacturer standards
- diagnosing the cause by isolating the excessively drawing circuit by disabling/disconnecting portions of the circuits or components (methodically from maxi fuses to mini fuses)
- diagnosing the causes of abnormal key-off battery drain
- determining needed repairs.
Process/Skill Questions:
- What is the typical allowable range for a parasitic draw?
- What is key-off load?
- How would a technician perform a parasitic draw test? Why is this test conducted?