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
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The other day I was installing an axle. When I pulled the new axle out of the box, an instruction sheet was present. I opened it up, flipped through it, and found an interesting noise/ vibration chart for drive line problems. Complaints, or problems, are across the top row, and possible causes are listed down the left hand column.

noise complaint chart
(click to see full size image)
This chart is interesting, accurate and a helpful place to start diagnosing drive line noise or vibration complaints. None of the information is earth shattering, but it is handy to have in a chart. More importantly, the lesson learned here is that regardless of how many times you have made a repair, if there are instructions with your replacement part, take the time to read though them, you never know what you might come across.