I want to add a water pump switch with indicator light in the bathroom of our 2551, likely placed near the tank heater switch. Looks easy to get wires to the pump under the closet bottom. Is it as simple as adding a hot lead to the switch and pump since the pump is already grounded? Does the indicator light add some complexity or will it only illumitate when switched on ( and a ground is established?)
Electricity and magic are equally bewildering to me...
Dougn
Easy peasey. Written assuming yours is like mine, a negative (not positive like I mistakenly put before... ) grounded pump with a switched hot (+) wire.
The new illuminated rocker switch with the indicator light will have 3 terminals - power in (+) , Ground (-) , and 'load' (the pump!)
The light inside the switch comes on when it 'sees' voltage going to the pump. The ground wire on the switch is just for the light, not the pump. If you already have the original switch on, the new switch light will come on to let you know the pump is already powered.

Try to source the positive from the same fuse as the other switch is fed from. If this is not possible, and you use another source, make SURE you put a fuse in line. Match the existing fuse value.
Negative wire should be a good ground.
Connect the new load wire from the new switch to the pump assembly + side. The wire you connect to is the wire supplying the pump,connected to the pressure switch. NOT the little wire between the pressure switch and the pump motor. (Otherwise the pump will run continuously.

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Either switch being 'on' will have the pump powered. The indicator light in the bath switch WILL light if you have the original switch on, or the new one. Makes it easy to see if the water is already on when you are in the bath.
The latching relay with intermittent rocker switches does have the advantage of being able to turn the pump OFF from any switch. If this is an important feature, please get the setup fandj refer to. With this parallel switch setup, if either switch is on, the water pump is powered. BOTH have to be in the off position to turn off power to the pump.
EDIT - put positive ground pump before... D'oH!