hey guys i need your help, my stock O2 sensor was eaten up which looks like a rat or something so i went to the local boneyard and found the 4 wire O2 sensor i need only problem was the engine had front end damage and i had no choice and limited tools on hand so i cut the wires. so now im at home and i cant figure out which heater wire is which. i looked in my helms and it only shows which is which if your looking at the plug not the O2 sensor itself and my stock one was cut also cause i tried to repair it but that was immpossible.

all i need to know is when you look at the wires coming out of the O2 sensor in this sequence black-green-black-white i just need to know which black is positive and which is negative for the heating element inside on the O2 sensor itself.

thanks

 

on the sensor clockwise
white, black1, green, black2

on the connector top left (by the part you press)
black2, black1, green, white

 

thanks for your help, i found a web page that shows an illustration about it. if you guys wanna check it out it also shows how to convert 2 wire to 4 wire O2

http://ludicrous2_0.tripod.com/how_to/oxy/