White 10 pin connector... Reply #15 – November 10, 2008, 03:07:18 PM The EGO sensor generates its' own little voltage, like a little battery.The positive side of this "little battery" is hooked to a wire that goes to the EEC. The negative side is the threads that screw into the exhaust manifold.So the negative (ground) circuit for the EGO is the EGO threads, the manifold, the head and the orange wire to the EEC.The purpose is to provide a low resistance ground for this low voltage and low current circuit.If it wasn't there would it find another way? Probably through the engine block, battery cable etc. Would it be as good? No. Quote Selected
White 10 pin connector... Reply #16 – November 10, 2008, 03:25:13 PM double post. It takes so long to post I think I forgot to hit the submit button. Quote Selected
White 10 pin connector... Reply #17 – November 10, 2008, 07:04:45 PM Interesting.....I haven't peeled back my harness to look, but I did take note of one thing when I looked under my car.....I have no #19 in the main harness diagram. Both of my HEGO sensors have grounds from their respective harness. Another ground comes off the firewall to the back of the intake manifold...I can't see where one of the ground wires on the HEGO harness ends.....I'll look further later.I also noticed 6 wires going into the HEGO harness on a connector that can accept 8 pins......the other 2 ports are blocked off....The only time I've ever gotten a HEGO code was a lean code 3 years ago running 19 pound injectors with the pressure too low when I first put this motor back together......Who wants to bet that I'm missing this wire? Quote Selected
White 10 pin connector... Reply #18 – November 10, 2008, 09:54:19 PM Quote from: V8Demon;242499Interesting.....I haven't peeled back my harness to look, but I did take note of one thing when I looked under my car.....I have no #19 in the main harness diagram. Both of my HEGO sensors have grounds from their respective harness. Another ground comes off the firewall to the back of the intake manifold...I see there is only one HEGO ground wire in your cable diagram. Maybe when they went from one HEGO to two they just cut wire 19 off and put it all into the HEGO harness.QuoteI also noticed 6 wires going into the HEGO harness on a connector that can accept 8 pins......the other 2 ports are blocked off....The heater wires are spliced so they only need two wires in the harness. Quote Selected
White 10 pin connector... Reply #19 – November 10, 2008, 10:31:57 PM C477 sources many wires of essential EEC functions like the MAP, TPS, IAC, ECT ect.There is an Orange / white wire.double check you do not have a dotted or stripped white tracer on that orange.Im not sure what the o2 sensors have to do with any of this but I see no relationship so far. Quote Selected
White 10 pin connector... Reply #20 – November 11, 2008, 07:07:03 AM QuoteI see there is only one HEGO ground wire in your cable diagram. Maybe when they went from one HEGO to two they just cut wire 19 off and put it all into the HEGO harness.Unwrapped the harness. Guess what? My orange wire is cut! THe piece from the connector is about 5 inches long......No sign of anywhere or anything that it should be connected to. One could surmise it went to #19 on the diagram I posted at one point in time....Your hypothesis makes sense. Interesting that they would just cut the wire like that if this is in fact the case though.QuoteThere is an Orange / white wire.double check you do not have a dotted or stripped white tracer on that orange.Im not sure what the o2 sensors have to do with any of this but I see no relationship so far.All other wires accounted for and intact Quote Selected
White 10 pin connector... Reply #21 – November 11, 2008, 04:55:15 PM Your a hell of a guy paul,to cut your harness up.That was what I suspected though, that they just cut it, I guess I"ll cut mine back off. Quote Selected
White 10 pin connector... Reply #22 – November 11, 2008, 05:06:53 PM Wasn't too hard. Won't take too long to tape back up either. I just put some of that plastic tubs sheathing on it for now.QuoteI guess I"ll cut mine back off.I was actually wondering if it would actually be better to leave it as a safeguard. You just went to the back of the head with it, correct? Quote Selected
White 10 pin connector... Reply #23 – November 11, 2008, 05:13:47 PM Quote from: V8Demon;242603Wasn't too hard. Won't take too long to tape back up either. I just put some of that plastic tubs sheathing on it for now. I was actually wondering if it would actually be better to leave it as a safeguard. You jus went to the back of the head with it, correct? No not really, ran it the throttle body, I think it's a dead end wire. so I don't think it would matter. Quote Selected
White 10 pin connector... Reply #24 – November 12, 2008, 06:35:07 AM CONFIRMED #19 in the harness diagram is in fact the orange wire from the white 10-pin connector. Quote Selected
White 10 pin connector... Reply #25 – November 12, 2008, 09:50:39 AM From my swap, I remember a wire or two in the 5.0 harness that went to nowhere(couldn't remember color)... Unlike Paul, I wasn't going to dig back into my harness...Hat's off to Paul... Quote Selected
White 10 pin connector... Reply #26 – November 12, 2008, 12:02:40 PM FWIW after some reading on the subject, I'm on my way to the parts store. I'm gonna rebuild that wire and attach it to the back of one of the cylinder heads. Quote Selected
White 10 pin connector... Reply #27 – November 12, 2008, 12:46:48 PM Quote from: V8Demon;242698FWIW after some reading on the subject, I'm on my way to the parts store. I'm gonna rebuild that wire and attach it to the back of one of the cylinder heads.For the right HEGO(passengers' side) the wire goes from the right head to EEC pin49. Orange wire.For the left HEGO, from the left head to EEC pin 44. Gray/Red wire.Are you sure the wires are not already there through the HEGO harness? Have you checked the EEC end of the harness ?If I understand you correctly, there is an orange wire in the bottom side of the white 10 pin connector that ends a short distance into the harness. That bottom side harness goes to the EEC.What does that orange wire connect to in the top part of that 10 pin connector. Probable nothing. Quote Selected
White 10 pin connector... Reply #28 – November 12, 2008, 01:01:55 PM Quote from: softtouch;242703What does that orange wire connect to in the top part of that 10 pin connector. Probable nothing.Yup you got it... They've only been that way for 20+ years, no need to go messin' with it now... Quote Selected
White 10 pin connector... Reply #29 – November 12, 2008, 04:45:19 PM Lots of info on a orange wire!!. Quote Selected
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