QUOTE(wilsonjack228 @ May 5 2013, 08:06 AM)
My family has 2 s3 and one of the charger only give avg 500 . Drops from 1000 , the second charger seems fine avg 1000-999.
Dunno cable or charger

lets call the second charger that gives 1000-999 = charger A.
your charger = charger B.
charger A gives 999-1000 max.
charger B gives around 500 max.
1. now try to use usb cable from charger A with socket from charger B. check the current.
-if max is 999-1000, means your usb cable is no good, and the socket is ok.
-f max is still around 500 go to 2.
2. next try use usb cable from charger B with socket from charger A. check the current.
-if max is 999-1000, means your usb cable is ok, but the socket is no good.
-if max is still around 500, then both your cable and socket is no good.
Bonus: use charger B with other s3 phone. if max is 999-1000 than your phone is broken