The other day a Nissan came into the shop. The battery and the alternator had been replaced. The car would start if you drove it, and let it sit a few hours, but would need a jump start if left over night. The battery tested good, and the alternator was charging plenty of amps, with no A/C ripple, and 15 volts. Sounds like a classic case of a draw.
I hooked up a test light and found the draw is on the fuse for the alternator charging signal. (For information on how to find a draw please visits here ) Occasionally, you will have an alternator that is charging fine, but back-feeds when the car is off and thus results in a draw. Given the fact that the alternator has already been replaced, it is highly unlikely that the alternator is the cause of the draw. So where do we go from here?
Upon inspection of the alternator, I found the following