Battery-going-flat diagnosis
Customer fits two batteries and both go flat. Where do you start without wasting hours pulling random fuses?
What this lesson covers
CORE TEACHING Battery health; charging; usage pattern; parasitic draw; intermittent wake-up; sleep states; module history. PRACTICAL DEMONSTRATIONS AND TESTS Verify battery; verify charging; measure shutdown current; log current; disturb door/handle/module and watch wake-up. ADVANCED / SCAN TOOL LAYER Scan network/module faults; current clamp logging; scope or data logger optional. KEY DIAGNOSTIC QUESTIONS Can battery store energy? Can vehicle recharge it? What is consuming energy when it should be asleep? MUST-COVER CHECKPOINTS Prove battery/charging first; prepare vehicle for sleep; establish current timeline; identify wake pattern; branch isolation; network effect; final component proof.
What you will be able to do
Customer fits two batteries and both go flat. Where do you start without wasting hours pulling random fuses?
Where it sits in the programme
- Builds on
- Lesson 10: Smart alternators and battery monitoring
- Feeds into
- Lesson 12: Automotive fuses