I just replaced my Casita's water pump. Had to connect to the power switch wire and tee into the ground wire. I would usually use a crimp splice, however I used a new type splice that I would recommend to everyone.
You can see all the different types at Posi-Lock's
CD and Joyce Smith - Lily, Violet, and Rose
1999 Casita 17' SD - "The Little Egg"
2007 Escalade - 6.2L V8 - 6L80E Trans - 3.42 Diff