I have a 1993, J Reg, Daihatsu Sportrak 1.6 4x4. Since I bought it 6 years ago, the battery keeps going flat if its parked up for a couple of weeks. After my fifth new battery, I realised it can not be the battery at fault. For the past 3 years I have been disconnecting the battery earth lead when I park. This is an obvious inconvenience.
The local auto electrician has disconnected the immobiliser, replaced the alternator charging diodes, new fan belt etc.
Last week he disconnected the battery earth and put his digital tester in line with that lead and the battery negative post. The reading was negligible.
There is a radio in the vehicle. It does not go through the ignition switch, but it is never switched on. Glove box, interior and all other lights are off.
The battery is a smaller unit than most other cars.
Any ideas on how to address this problem would be more than welcome?!!