So for awhile, my rig had a bad 50amp circuit breaker for the hydraulic leveling system (which I have now read that 80amp is prefered). I replaced it with a 50amp breaker about a year ago and all has been fine until tonight. For some reason, I find that if I use a stabilizer under the tongue, the RV will get out of level (separate issue). So I went out and removed the stabilizer and hit the "auto level" button for the leveling system. The system attempted to raise the front, but the pump was really loud (almost like it was running dry, but has plenty fluid) then it beeped and said: "Error, out of stroke." Well I am in a very level site and have stacks of blocks under all my jacks... so there was plenty of jack left. After a few more failed attempts at "auto level," I just pushed to manually lower the front jacks and after a few moments of loud pump noise, it went back to a normal sound and the jacks lowered. I then decided to see if the jacks would retract so I retracted the 4 back jacks. They went up like normal but once the last one went up and the pump was under more stress, it didn't make its normal "the jacks are up" noise, (which I find to be quieter) it made the loud noise again. I then auto leveled and everything worked as it should. When I went inside, my wife told me that all the lights went very dim (almost off) when the pump was being loud. I then retracted my main slides some, (also hydraulic) they went in like normal. When I let them back out, once they were out all the way, and the pump was under stress, sure enough, all the lights went extremely dim. Any ideas? circuit breaker again? Pump going out? Battery going bad? I have not checked the battery with a volt meter but the little gauge on the RV reads "full" when you check it (on the same system that checks the tanks and it is the original battery so its getting old).