Obviously there is a problem of the battery draining faster than it should. There is something strange in the electronics of the Aero. A friend had the battery going flat overnight because when the voltage dropped to a certain point with his old battery there was a constant drain of 1.5 amps (if I recall correctly). Fitting a new battery resolved the problem. In the mean time he had to use the immobiliser switch under the bonnet.

In this case it would seem that when the ignition is off the current from some source is finding its way to earth via the dash warning lamps. Perhaps it is due to a design fault that has a relay wired incorrectly, or an incorrect type of relay has been used. You may be able to find out which circuit it is by pulling fuses. If you find out what it is, and if nothing that should function with the ignition off is involved, you may be able to isolate it with a simple relay that switches when the ignition, or accessories, are on.

Peter

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