transit van

[plutogale]

[I have a old transit van which has a fault .The battery diss charges when it is standing, thought it was the battery and so fitted a new one, same problem.Battery charges o k when it is running

 

[Burnerman]

If all accessories are off, then the alternator has a blocking diode fault.....try unplugging the alternator and see what happens.
If no joy here then try unplugging each fuse in turn to see which one is drawing current. Ideally you need a 10 amp meter in series with the positive battery lead to ascertain this.
Popular faults are the interior lighting and central locking circuits.
John

 

[plutogale]

Cheers John I will give it ago