[David Kent @ KentKleen]

No this wont cause problems. 12v Power is 12v power wherever you take it from. You have a drain from the battery somewhere. Pop to any GOOD motoring shop (motor factors) (not motorworld) they will have a piece of test equipment (supplied by there battery supplier) which will enable them to not only check the condition of your battery but what current is getting drawn from it at rest. It involves dissconnecting the battery and placing the meter in between the positive power cable and the battery. 
Hope this helps. The drain from the battery could be anything . Starter motors, alternators, radio or your pump and controller are prime suspects. A cheap under capacity split charge relay will heat up and its contacts will melt, this could cause the short. A good old fashioned auto electrician will sort it quickly.
Hope this helps

[paul ette]

When I reconnect the battery after I charge it, there is a noise from Central locking, is that normal?

[David Kent @ KentKleen]

Does your van have a central locking alarm on it?? If so this can be normal

[Paul Coleman]

i dont think its got a seperate battery , cant see one, as far as i know its all rigged to van battery.

OK.  See what you mean.  I should have read with more care.

[paul ette]

ive disconnected pump and controller, will leave it till tonight see what happens, really anoys me when people sell vans that have an obvious fault and dont tell you, its not as if its an expensive thing to fix , just a pain in the ass

[Spruce]

Hi Dave

Thanks for coming along and adding your expertise as an ex auto electrician.

A drain on the battery can be a tough thing to find if you are a novice. An experienced auto electrician will do this on a regular basis and will have a plan of where and what to start with.

Cheers

Bruce

[Smudger]

Cheers spruce,

It is an aftermarket radio,

I'll look into this week thanks for the advise

Back to the original thread topic 😃

Darran

[Spruce]

Paul

I didn't realise that you had bought a van with a sysyem already in it - gleaned from another post on hot water.

There could be some other accessory that he has fitted to the system that has been left switched on that is draining the battery - a 12v hot water heater element etc.

I would phone this guy you bought it from and tell him your problem (nicely) and ask if he is aware of what it could be that's flattening the battery. Didn't someone once try to use those 12v electrical water heater units for the windscreen washers on his wfp system?

[paul ette]

the hot weater heater seems to have an ignition from batterys, after leaving pump and controller off over night it has started this morning, still not 100 percent convinced so will start it again tonight fingers crossed