APM1 current draw and powering

I have a very inaccurate ammeter. It did show that my APM1 is using more than 500ma!
GPS, magnetometer, airspeed sensor, and Minim OSD was connected.
I have found this impossible, as manual states that there is a 500ma fuse inside of APM1.

Some people are using the same sensor set that i do but they also have Xbee connected, so their current draw should be even higher than my...

Is there anyone equipped with a accurate ammeter?


My other question is, what happens if this fuse goes off?

Do i lose full control of the plane, or  i still have the regular control (manual mode)?



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