As i in my thread autolec proper garage did the drain test 28 hrs .025 millamps drain for the ECU is the standard 74 amp battery should take months to drain i bought the tester because i thought i could sort it before i took it into the garage only cost £10 at maplins ,he couldnt find the fault its intermittent another thing somebody mentioned diconnect battery live side connect ammeter pull fuses i have to correct you on that ground side for shorts they short to ground ,relays live side pass current or voltage some where else.