Almost fried my APM !!! need help

I don't know what i did wrong but i almost fried my APM (lots of smoke !!!)

Yesterday i soldered on an external BEC  Pluged everything in and POOF  smoke came out , the BEC fried all up and the black wire on the servo lead from the ESC fried as well even though everything was plugged into the APM it still works fine i cant believe it !!!

as far as i can tell i didn't plug it in wrong (but obviously i did )

i soldered the bec onto the battery wire and pluged it into the #5 IN on the APM

i took off the red wire from the ESC and left on the white and black wires.

 

can someone tell me what happened exactly ???  before i really do some damage.

 

 

sorry guys ,.

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  • Moderator

    photos usually help. Even if they don't, those of us who have made bad mistakes like to see pictures from other people who have done the same so we feel better ;)

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