I trouble shot this issue three times and realized I made a mistake on the first go.
I'v been dealing with a battery drain issue for sometime. My disco has become a secondary vehicle. I broke out the test light and have discovered that the drain is coming from two sources, one being the 100amp alternator fuse and the second being the smaller 30amp ABS fuse located under the hood near the alternator fuse. The drawers was around .5 volts. I'm not sure what one system has to do with the other. Any help would be appreciated. Thank you.

Does this point to the alternator diode? The alternator and battery are 3 years old.

 

Yes it does in most cases. There are three diodes. I suggest having the alternator rebuilt by a local auto electric shop...... The ABS fuse is for the relay, pump, and a portion of the ABS ECU. If you don't care about having ABS pull the fuse. If you care about it you'll have to find the short.

 

Thank you, I have just a shop that I go to. I stopped by yesterday and he tested the Alt on the truck and said it was fine. Told me to further trouble shoot it by removing the exciter wire and use my multimeter. I'll have him bench test it and just have him rebuild the alternator.

 

If I pull the alarm fuse and lock the car will that create mayhem? I'd like to disable the system, but still be able to lock/on lock with my key.

 

If you do remove the fuse remove the wire from the drivers side lock, that way the alarm (if a portion is still active) won't know if it's locked or unlocked. Try it, see what happens.