Posted by 550Doug on September 27, 2020 at 14:11:12 from (204.237.56.195):
My 2003 Buick Park Avenue has a parasitic draw that I've traced to the ECM by eliminating fuses. However, I understand that there are some items on the car that are not fused and would show the same symptoms. Also, it may be possible that a blown diode in the alternator could be the culprit. In any event, it's been sitting for a week and so when I jumped into it last night it started right up and I picked up a pizza and returned home, a 10 minute job. I noticed the battery volts were reading 13.3 to 13.5v while I was driving. However, when I turned off the car the ignition key would not release from the switch. I left the key there.
Today I went to start the car and there was no power at all. My voltmeter measured 4.5v across the battery terminals.
How can a good Interstate battery (only 11 years old) die so fast? Could this be a possible bad diode in the alternator?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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