Well my 2000 Disco 2 was suffering from a slow battery drain, after several dead batterys and replaced parts, we were able to take OHM reader and isolate the circuit that was responsible. It turned out to be the speaker circuit, I pulled the fuse for the speakers and no more drainage problem. SO my question is: Does anyone have any ideas on how to/if there is a fix for this issue? I enjoy driving the car, but having some music to drowned out the voices in my head hen I drive would be great.

 

you know what I have the same issue in my discovery II and I will try that.

 

So, I am guessing on this one.
I used to repair a lot of electronics.
Probably the output transistors are leaking.

the big bass amp in the back could be a culprit.
Best to look at a schematic.

I would think -
that the circuits for all these amps are OFF when the key is out.
there is probably a relay which powers all of this.

If the relay is sticking closed, then even with the key off - your amps are running and using power.

You could find that fuse you pulled.
Put the meter in the 10A function.
Put the red and black leads across the fuse - where the fuse plugged into.

This will give amps drawn by that curcuit.

Then, turn off the key.
One would think the drain would go off.

If the current is still showing with the key off, use your fist and pound the foot wells where I assume that relay lives.

If then the current goes away, the relay is sticking.

This is a long shot.
I can't think of anything else which would cause this.

Well, OK, maybe the amp is always connected to the battery and the amp is enabled by a switching transistor when the key is on.
And, that switching transistor is leaking current.

Amp would need to be replaced.
You could take the back bass amp off line -by unplugging the pig tail to it and see if the current draw is gone.

There is probably another main amp for all the speakers. Not sure where that one is.

 

Thanks jfall, that's a great (and thorough) starting point. Appreciate it!

 

When the head unit is turned on it turns on the amp via signal wire. I'd say either the relay in the amp is stuck or theres an issue with the HU keeping the amp powered. I'd start by checking the draw then unplugging the HU to see if it's still there. If no more drain it's the HU. If the drain is still there then unplug the amp.

There's no separate bass amplifier in the D2 so that saves a step there.