Posted by Simpleman7140 on September 19, 2018 at 15:28:50 from (99.98.85.66):
Good evening all.
I have a 1959 Ford 641 Workmaster. I bought it about 3 years ago. It is still 6 volt system with generator.
It has ran and started great the whole time I have owned it. All the wiring looks to be in great shape. Last year the fuel gauge stopped working. I replaced it and the sending unit. It shows full or empty depending on how I wire it. I gave up on it.
The battery failed last week.
With the help of you guys here I have discovered the battery had been put in as a negative ground by the previous owner. I have been bench testing the fuel gauge and sending unit with the new battery. I can get it to work if I touch the sending unit to the positive post with the ground wire on the positive post and the "B" wire on the negative post. This is with a new battery that has not been reverse charged.
If I drain the battery and reverse charge will the fuel gauge work?
I believe I will have to reverse the generator polarity. How do I do that?
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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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