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To check for a small back leak ( battery drain ) get a el cheapo multi meter with the " 10amp function " turn everything off, close doors etc
Remove Negative ( Black lead ) from you vehicle, Now on your multimeter move the RED lead to the socket that says 10A, then turn the meter dial to the 10A setting
Put the multimeter red lead to the vehicle Negative and the multimeter black lead to your battery ( or vice versa, one way will read something like 0.05A other way around will read -0.05a)
You are putting the meter in series with the battery so don't try and start or turn anything on as the meter is rated to 10amp.
Screen will tell you how many Amps your vehicle is drawing with everything turned off, There will always be a little draw, this is your ECU, Clock, Radio memorys etc and some cars stay "awake" for a few seconds after you put the meter in series, so Amps may jump up a little then settle down.
Hope that makes sense in text format, if you get stuck flick me a PM and i will give you my number, or if you ever come down to Perth myself of one of the boys in the workshop can check it for you
Also the Ctek maintenance charger's are the ducks nuts for keeping your batteries going.