My 2001 TD5's battery has been randomly flat over the last couple of years.
Several autoelectricians have been unable to pin point the problem, though the consensus seems to be that the cause must be a random slow drain. The battery is OK and the alternator was replaced last year yet the problem still exists. If anyone has had a similar experience or any suggestions as to what might be causing the problem, I would greatly appreciate it.

Tom F

 

Not a Disco I, wrong category. The people you want to see this won't see it here.

 

If you are fitted with the SLS system, the air valves and compressor can run during the night in an attempt to keep the coach level for the potential approach of the royal master. They might be running too much if there is a slow leak. One way to detect this is disconnect the common ground spot for them under the hood. Then they can't run.

Slow leaks in air pressure things can be searched for with a spray bottle of soapy water. The soap blows bubbles or larger bubbles from the leak.

The ground is C0811, in the pix it is on a stud with the ground for the fuel pump, which has to stay connected of course.

Have also seen posts about amp system not powering down when radio off, but that would be a constant drain and tech should have caught that.