The old "watch for a spark" or a test light in series won't work with the new electronics.
The only reliable test is with an amp meter. The system needs a real connection for everything to charge up and drop out, may take a few minutes for that to happen.
If the load doesn't completely go away, you can use the amp draw to calculate how long it would take to discharge the batteries. If the numbers don't add up, that leaves the batteries to blame.
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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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