Thread: 2000 disc 2 Battery drain

G day, we have a 2000 disco 2 TD5 with auto box, it has a battery drain, if I don’t use it for a few days the battery will die, it has had a resent new battery, and we have discounted it because if you disconnect it and leave it then reconnect after a week it will hold charge fine,
Someone we know has said that if the relay under the bonnet clicks it could be this; I believe that it’s the ace relay, which in at the rear of the pack of relay on the driver’s side, this does click for a while but after time fades out, and is cold after a long while.
Has anyone had experience of this, would sticking the vehicle on a diagnostic show a faulty sensor or something!
Any points would be of great help.

would sticking the vehicle on a diagnostic show a faulty sensor or something!

Probably not.
Do you have access to wiring diagrams and a multi-meter?

You could try a voltage drop test across the fuse to check for parasitic loss.
Not a Silver bullet but tried and tested method for finding those losses.

Make sure keys are out of ignition, no lights are on (glove box, doors, etc) and allow about a couple of hours to make sure all modules are 'asleep. Set the multi-meter to milli-volts and measure the voltage drop across each fuse in each fuse box location and compare to the table.

Check any circuit without a module that has any current draw and any circuit with a module that has a greater draw than 40mA (0.04Amps).

Once you find the circuit that has the draw, start disconnecting items on that circuit until you find the source.

You may need to find tables for other fuse sizes. Google is your friend.
Good luck.