I am just documenting this to maybe help others in the future. I had to go through this today to get my water pump going and my water system sanitized.
Going back to the start, I was going to dump my fresh water tank so I could then sanitize it. I pulled the dump lever and nothing! Crawled under the coach and found that a prior owner had installed a pipe plug in the outlet! Unscrewed it pried it out, pulled the lever and out comes near 100 gallons of old water. Start to add more water so I can sanitize the tank and system and see a small leak at the dump pipe. There's the reason for the pipe plug.
I don't have the parts or time today to fix the tank seal, but will order it and fix it properly.
Needing to sanitize the tank I decided to follow the prior owners shortcut. The pipe plug would no longer seal as it had been over tightened and cracked the abs pipe. I decided to get a 1 1/4 inch to 1/2 inch pvc bushing. I screwed a 1/2 inch hose barb into the bushing and chucked it into a drill press. Sanded it down until it was small enough to fit inside the abs pipe and glued it in with transition cement. There was not enough of the pipe sticking through the sealed area to use a 1 1/2 inch bushing over the abs pipe. I added a 1/4 turn boiler faucet so I could drain it through a hose next time instead of directly under the coach. That's my band aid for now
I added bleach and filled the tank with water. Turned on the pump switch on the remote over the door , the pump light came on and nothing! It was working a few months earlier. Checked the fuse and it was good. Checked power at the pump and no power. Pulled off the positive lead and jumpered it to the positive cable going to the inverter and the pump started running. So now I know that the pump works. I tried to follow the wires to see if there was a inline fuse, dead end. Then I went inside and removed the remote over the passengers seat. Tested the switch and only got 11.9 volts even though the pump light came on.
I pulled out all the wiring and unplugged the connector plugged it back in flipped the switch and the pump started working. Flipped it again and it didn't work. I cleaned all of the contacts which looked fine and it still didn't work. Pushed the connector together tightly and it worked again. I got a cable tie and put it around the connector and tightened it up. Now it is working like it should.
As a side note as far as I can tell I only have one switch for the water pump, the one in the remote. I have another switch labeled water pump, see picture, but it operates a pump for the Hurricane heating system. I understand that some people have more than one switch.
