Ther is something draining the battery once its connected in the vehicle.
Try unplugging four or five relays in the fuse box. Wait the usual time and then see if the battery is dead. If not, one of the circuits controlled by the unplugged relays is the problem.
Next, connect a voltmeter to the battery and then install one relay at a time while watching the voltmeter. Once the problem circuit is reconnected the battery voltage will drop slightly. Now you've found the circuit which is draining your battery.
If the first four or five relays that you disconnect don't reveal the problem, try 4 or 5 more until it is found.
If you have an ampmeter with an amps pick-up probe this would work better that the voltmeter in detecting the problem (its more sensitive)
Sunday, December 2nd, 2012 AT 7:04 PM