4 wire heated o2 wiring

[eutu1960]

I have an a/c delco afs75 o2 i would like to wire up to a 7727 ecm, the 4 wires going into the connector are white, blue, black and black. I need to know witch wires are what, I know that one goes to the ecm, another is 12 volts, and 2 are ground, I just need to know witch ones. thanks.

[eutu1960]

From what I can tell by googling images, the 2 black wires are for the 12v heater, the blue is for the signal to the ecm, and the white would be ecm ground. if anyone can confirm it would be appreciated.

[lionelhutz]

That sounds right. They always follow the same pattern - 2 wires same color are heater, remaining darker colored wire is signal and remaining lighter colored wire is signal ground.

[eutu1960]

That sounds right. They always follow the same pattern - 2 wires same color are heater, remaining darker colored wire is signal and remaining lighter colored wire is signal ground.when I get around to it I will hook 12v to the 2 black wires just to see if it gets hot.

[eutu1960]

2 black wires are defiantly for heating the o2, hooked 12v to them and the o2 gets hot.