Belgain,
I found the sensors and replaced them.
In the process of replacing the sensors I noticed the 4 probe wires merge into a "black tube full of silicone" and only 2 wires emerge. They go to a plug that feeds to the wiring harness. On a whim, I unplugged them and checked the panel. Black tank still showed 2/3 full, even with no sensors connected.
And this is why I am interested in finding a detailed schematic of the electrical system.
As a side note, while on a trip, I left the black tank sensors unplugged. I noticed the gray tank was not reading. I plugged the black sensors back in and the gray tank was registering again.
I am thinking I have a short.
Thanks for the suggestions.
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I have not yet begun to procrastinate.
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