Took the interior fuse box out stripped back insulation to get on the individual wires. I can see the main feed wire which is the same thickness as the wire on the main bus fuse and clamping it I got a figure of 200 milliamps which from previous experience I think is correct, so that eliminates all consumers on the interior fuse box (for good measure I did go through all the cables as well) Of course the mystery is where is the 600 milliamps going. Some where between the bus fuse and the interior I have a drain.
I checked out the snappy tool and I thought how is this checking amp draw across a fuse? My guess is it's looking at small voltage drops across the fuse blade, so I ran a little experiment. Using a digital volt meter (auto ranging)I checked a fuse with no draw and had exactly 0v registered, with a consumer switched on the same fuse registered 0.02v, basically if there is any v reading then that fuse is drawing current. Biggest problem is the mini fuses very often don't have the terminals exposed.
Sorry for the long post and thanks to everyone's input.
Mark
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