How did you set your meter? It sounds like you would have to move the one lead to the 10A socket if current is over 400mA. Then set the dial pointer to 10A. To read up to 10A, the meter likely has a shunt inside that will add a certain amount of resistance to the circuit but not much.

I ask because I have at least once, forgotten to move that lead and then blown fuse inside meter! Looking at your picture again, I think you may have the meter leads in wrong sockets. Black should be in center (COM) and red on left (10A). meter manual

I have a clamp meter that will read DC (not all will). Not sure it would be very good at low currents. Need to check range and accuracy.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5