Sam, have your Husband check what he has guessed to be the problem. I think he's right. If none of them work, it sounds to me like the ground wire is not attached and is possibly broken. The point where the wires connect to the probes is fairly easy to get to, if you crawl under the trailer tanks. They are fairly exposed and I'd suspect they could corrode pretty easily too.
I can't tell you how your wires are routed, unfortunately, but I'd think he could check the ground connection with the continuity function of his multi-meter. I'm guessing it grounds to the trailer frame, but I'm relying on memory here and it's been a few years since I worked with this system.
I replaced all my grey and black tank probes with the Horst Miracle Probes, and have had excellent results with them. They're not too expensive and not too hard to put in (the highest was the most difficult).
- Jack
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