Regarding battery leakdowns, I have a friend who is a modern auto electrician, by which I mean he has all the latest kit code readers, etc., but for a suspect earth he does the following: Connect a multi meter (set at volts 20 position) between the battery negative terminal and the engine block. Get someone to crank the engine and a reading of no more than 0.5volts should be present. For a static drain check, remove negative battery lead, then put a multi meter (set in the amps position) in the line between the negative lead and the negative battery terminal. The maximum reading should be no more than 250mA. I thought it may be useful to your readers.