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Sounds like you have ( at a guess ) charger failure , first thing to check would be the inline fuse / and the internal charger fuse.
And tap microswitch failure ( you can tell if you have a microswitch system as you'll have wires going to the underneath of the taps ) .
If your pump has run continously for some time you may also find that has failed . 
The warm wire i suspect was caused by the voltage dropping , this caused a increase in amps to try and send power to the lights etc .

atb

Wizard

if you have a pressurized system ie.no micro switches or wires to the tap.then it could be the pressure switch has failed or needs adjusting.or if you have run out of water the pump would not stop running as it is trying to build up and maintain pressure.if this so the pump will burn out after some time. odd times a micro switch if not used for a long time can stick in the on position.this would also make the pump run non stop. pressure switch from wizards page.to adjust undo the nut screw all the way in the centre screw .open a tap and screw out centre bit slowly until you have water flowing and it is just started clicking.close tap.tighten lock nut.

not sure if this is same problem but last winter. i was on a local site,and had very simular problems to you.

i 12v gage dropped when using water pump and it carried on pumping at all times.as soon as i turned power to pump off the 12v gage shot back up.

this was in turn telling me my battery was fine etc.so i striped pressure valve down cleaned and put back tested pump on another caravan etc this worked fine.

solution was found when a fellow camper told me 240v wasnt very good and may not even be 240,i charged battery with jump leads from car and worked perfect.

ive not had any problems since other than when my 12v power supply dropps

I'm not sure if it all ties up with the pump being on continuously though

would it run if it sensed a voltage drop ??? not sure myself.

But I think as the voltage droped so the pump probably went slower and I am hoping that is why there wasn't any water coming out of the taps at that stage

agree it should run slower.check it still runs wired to a battery.