Today my son and I installed the replacement ISS wireless transmitter. Since we have already done this once, it went a lot faster than the first time. If you ever have to replace one of these, after you take your old one out, change the DIP switch ID on it to be something different than what you have been transmitting on. That way, when you put the new one in, it is not competing with old one at your console.
While we had the ISS apart, we used Herb's recipe to fashion some speaker wire inserts to stick down into the solar panel connector so we could test the voltage. We got a voltage reading. It wasn't 2.2 volts, but we were doing this on a very overcast day and trying to beat a snow storm so the sun was not shining. The fact that we got a voltage reading tells us the panel is working.
While we had the collector cup off, I gave it the annual Rain-X wipe down.
While the transmitter is being swapped, WeatherCat will start accumulating sensor errors because the outside sensors are all unplugged. In 30 minutes we racked up 6,794 sensor errors. They are all cleared out when you reboot WeatherCat.
In 5 months, if the battery doesn't go out, we will know this puzzle has been solved. If the battery does die in 5 months, we will know the Solar Panel should be replaced. If that doesn't solve our issue, we will be officially stumped.
Stay tuned. I'll report back in September.