Top 10 Signs of Alternator Problems | HowStuffWorks 05/10/2009 · As we've already discussed, if the alternator is not recharging the battery properly, the battery won't be strong enough to confidently and smoothly turn on the car. If you're stalling even after the car has been running, the spark plugs might not be getting enough power from the alternator to keep the engine going. In other words, your battery isn't dead yet, but it's well on …