Electric Shorting

Good afternoon All
Sitting last night having a lemonade and the water boiler switches off, lights in pull down bed area, water pump, lights in bathroom all stop working. Fuse blown.
Replace fuse and she blows.
Wires to water pump roasting and it's not working.
I Wired in spare water pump we carry and it's going full hog. Even when the water taps are turned off the pump is going.
So I have placed a toggle switch on the live to the pump and we can operate in the cabin
What's happened?
Does anyone else keep the water boiler on constantly?
The old water pump is fecked now but would it short the rest?
Thanks gang

We leave ours on also.

Good point- and where would this pressure switch be located please? Thanks

Have a look at this it might be of help:-

http://www.practicalmotorhome….ter-system

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See the shape of that. Welded together!
Hence the pump failing, hence the fuse going!
New switch needed I think? Save the switch = replace the wiring!!

Of which - if the connecting wire is replaced with equivalent thickness diameter - is there a resistance issue or is it an amount of current to dictate the diameter of copper wires?

Is it the wires are coated in somewhat waterproof coating?

Do we need a specific wire if replacing??

(PS new pump knackered before switch identified as wrecked)

The switches are small microswitches and are quite fiddly - i am replacing both as it appears that these switches and that of the Thelford toilet are controlling the 16Amp potential running through them. Alot for a wee switch i think~?

Anyone wire in a Thetford c3 loo before? The Relay with the three wires - can these relays fail as there always a poor water flow from this outlet before the fuse went and to get flow - a turn of the water tap created the fill. The Manual shows 3 Amp fuse inline while there is a 20Amp stuck in here for some reason. If the relay went - surely the water pump would not operate at all?

I am used to three wires from a switch - two controlling the negatives and one with live - but the microswitch has only two connections which are in a loop with the water pump. i.e. Live going into the pump then through the tap microswitches and back to the negative. So when microswitch closes - the pump operates and water runs out of the open valve.


Found circuit diagram and instalation guide. I will try it now!
Yip - got life in the toilet bit, now when the switches arrive - put them over these pump connections also and she should work ok.


As always - any help greatly appreciated!

OK - got a new relay with a 30Amp fuse in it - linked it up and rewired the taps into the water pump and the fuse etc doesn't blow.
So the knackered relay blew the fuse and welded the micro switch wires together.
Hope the post helps someone else. Its a standard Relay also thanks to Simon LTS.