Recently my 2010 TDI sportwagen died while at the mechanic for something else.
I came to reclaim it and they said "You can't drive it! The alternator isn't charging!"
I got the car home without issue and charged the battery up.
Curious, I hooked up the VAG-COM and took it for a drive.
At startup, battery voltage showed 12.46V with a dip to 10.72 when cranking.
Generator load, however, sat at 0%. I panicked thinking this was the problem they described. However, once I started driving and the RPMs exceeded *1500* the alternator began charging! (Load while cruising ~41% and Voltage showing 13.83V). If I stopped at a light and RPMs fell back to idle @966 RPM the alternator would continue to charge, no problem.
My conclusion was that at the dealer they had started the car and left it idling while testing the other issue. But because the RPMs had never exceeded 1500 it subsequently drained the battery. This would also explain why it's never happened to me because I've never simply started the car and left it to idle.
But the question remains: What gives?
Is this normal behavior? Some form of energy savings idea?
I came to reclaim it and they said "You can't drive it! The alternator isn't charging!"
I got the car home without issue and charged the battery up.
Curious, I hooked up the VAG-COM and took it for a drive.
At startup, battery voltage showed 12.46V with a dip to 10.72 when cranking.
Generator load, however, sat at 0%. I panicked thinking this was the problem they described. However, once I started driving and the RPMs exceeded *1500* the alternator began charging! (Load while cruising ~41% and Voltage showing 13.83V). If I stopped at a light and RPMs fell back to idle @966 RPM the alternator would continue to charge, no problem.
My conclusion was that at the dealer they had started the car and left it idling while testing the other issue. But because the RPMs had never exceeded 1500 it subsequently drained the battery. This would also explain why it's never happened to me because I've never simply started the car and left it to idle.
But the question remains: What gives?
Is this normal behavior? Some form of energy savings idea?
Battery only begins charging once RPMs reach 1500?
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