Hello, I have a 99 Oldsmobile Bravada with a 4.3 Eng. Its got a 12 volt battery drain with all fuses pulled?
what next ?
Pull the plug on the alternator and see if the draw goes away. If the draw is still there then take the battery cable off the back of the alternator and then check again if the draw goes away.
If this procedure checks out OK, then start disconnection components in the car like the PCM, BCM or any module you see. Recheck after each is disconnected to see if the draw goes away.
Get back to me with your results, we can diagnosis the problem further if needed.