Originally Posted by ScottyDog
If it's a float switch type it won't use any 'standby' power from your battery. If it's the computerised type (as is my current Rule) it will use negligible power while it checks if there is any water. There are 3 connections on this pump:
A negative - always used
A feed which will cause the pump to run all the time (this is switched on and off if it's wired as a manual pump)
The third connection is used instead of the above feed if the pump is required to run automatically so just swap the wires and connect this one if this is the mode you wish to use.
Important - Make sure your supply is via a fuse and not straight from the battery as mentioned in a previous post as you could have a nasty fire on your hands if it malfunctions/gets shorted etc. Just check the isolator does not take away this feed if you switch it off when leaving the boat.
I presume you only need the pump on auto when you use the boat as you can leave the bung out in storage and it will always be draining whatever the rainfall - or am I missing something ?
cheers for the info it is a computerised type, I will have a look at the electrics on the weekend, i need the pump to work in auto mode when the boat is in the marina the switch on board is only 2 position currently on or off but hopefully after re connecting the brown/white cable it will be on or auto,so i will need to keep an eye on battery drain.