Hi Dennis, it was me you spoke with a few months ago. My board has the EXACT same symptoms.
Here is what I found out so far;
- You are right about Larson, I went through the same exercise. Spent considerable time tracking them down...no luck in replacement/repair.
- I did speak with an electronics troubleshooting company. When I first approached them last year,they were willing to troubleshoot/rebuild the board for maybe ~$200. I called them back (with you in mind as you said you were interested) and they have changed their tune. Sounds like they have taken on some bigger customers and were not as interested in fixing our boards. They would do it, but wanted to get some minimum amount of boards to make it worthwhile (I don't blame them).
- I tracked down an identical board (finally) from another member (who had a tree total their AS) they said their system was working fine. I received the board, plugged it in and ???gues what, same symptoms....so...sounds like the problem is elsewhere (which is good news, I think).
- BTW, I called DOZENS of salvage yards, even had some other members visit salvage yards around the country and could not find a single one of these boards...so good luck trying to find one.
So what's next? As I believe the problem lies in the wiring harness, some where between the board and the tanks, I will get under there AGAIN and look some more. I am convinced it is NOT the board. The weather has been too crappy here to crawl around underneath and troubleshoot this. I hope to get to it this week. I believe it is a commen ground that is the problem, as you have found, battery level is fine, light, fan, etc all work. It is just all 3 tank indicators that quit working. I will post details of what I find and how I fix it soon.
One more option; a simple meter (Radio Shack-mounted inside cabinet?) to monitor fresh water level. As you have noted, I can get around the gray/ black tank levels. Fresh water is critical....
Stay tuned, Bill