Can Alternator Cause Battery Drain. After researching the site I read that a drain like this is usually caused by a bad diode and can easily be replaced without forking out the for a new alternator. The battery goes dead if the car is not started every three days.
After researching the site I read that a drain like this is usually caused by a bad diode and can easily be replaced without forking out the for a new alternator. Although the alternator is not the typical cause of a key-off parasitic drain I have encountered it. A faulty voltage regulator can also cause.
I have seen known bad batteries and alternators test good and vice versa.
If your battery is draining while driving it is almost without exception the F150s alternator that is causing the problem. Alternator Problems Battery problems can quickly arise from alternator problems. If I disconnect the alternator lead to the battery will this stop the drain. But a battery-power drain can also be the work of a bad alternator diode or even a faulty batteryDepending on the amount of current being drained a parasitic draw will suck all the juice from your battery in a few hours or minutes.
