Problem solved!
I was checking the 12 volt grounds behind the converter. There is a grounding lug screwed to the floor for additional 12 volt grounds. I had checked them for tightness earlier but this time I decided to pull each one out to check for broken wire. Some had more than one wire going in the grounding clamp.
I pulled the one that had the water pump going to it along with two other wires and when I went to put it back I got a spark. I separated the 3 grounding wires and found that one wire coming from the overhead light in the dinette slide had 10.5 volts going to it??
There is no access to the wiring above the slide so I went under the slide and was checking the harness when I discovered a grounding lug from the battery to the converter was not connected to the frame. The bolt had broken. I refastened the ground lug and the water pump would now work without flickering the LED's.
The dinette light grounding wire is still getting feedback but at this point it does not seem to be affecting anything. The light works and fuses are not being blown???
