Converter going bad? *long*
About 2 months ago we bought a used 2004 BH27. During our first camping trip I realized the battery wasn't holding a charge for very long and put it on the list of things I need for the camper. Well our last camping trip this weekend, we were on shore power and I used the bathroom and turned the fan on. A min later the lights all went dim and the low battery tone from the lp detector started. I turn the fan off and things brighten up a little but still clearly on the battery and not shore. After poking around a bit I notice that all AC items are working fine and DC is running off of the battery alone, which is about at the end of its life.
So I unhook the battery and all DC power is back at full! So I was thinking somehow the dead battery was shorting out the converter. Then I headed down to the local walmart and got the highest rated AMP hours marine battery I could find and brought it back. I noticed when I got back about an hour later that the lights were still working. I hooked the battery up and went in to check things out. The battery meter showed full (which it always did on shore power) so I powered on a few things and checked again and it was at 2/3. Clearly running on battery alone again. I went out and pulled the inline fuse that cuts the battery line and went back in. Lights back on full and battery meter shows full again. So I was thinking that there is some kind of switch that is not allowing the shore power to power the dc while there is a good battery. well I figured I would spend the last night with the battery unhooked and run the dc on shore so that I would have a full battery for the drive home to power the brakes if needed. After about 10 mins of just running the dc off the shore power the lights and everything dc died. No power at all. So I hooked the battery back up and power was back on. A few more tests and it seemed that the converter was working sometimes. I spent the night with the battery hooked up trying to use any dc power sparingly and we made it just fine.
So, now I ask, is my converter dying? I thought at first it could be a fuse, I checked all of them in the power box but couldn't find any other hidden ones that are mentioned sometimes on here. However, I figured if it was a fuse it would be out, not intermittent like it is now.
2008 GMC Yukon XL Denali 6.2
2004 Jayco Jayflight 27BH