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I could use a little help. I recently rebuilt my engine wiring harness. The original conduit was completely disintegrated and several mounts were loose. It cleaned up very well I put it back in today. Everything went great... EXCEPT for one stinking connection. This one:
I have this one ring terminal that for the life of me I can't figure out where to attach it. I zip tied to the upper radiator hose just for now so I don't lose it.
I checked it for ground and it's not ground.
The alternator is right there below it as you can see. The fusible link is properly connected to the starter. The most likely answer I can come up with is this terminal is supposed to be attached to the same post on the alternator as the fusible link, but I don't know. And if that's wrong, it could really eff stuff up. My manual shows me no reference to this.
Could somebody please go snap a pic of this ring terminal on their car and where it's attached to? I would really appreciate it.
That is a ground wire, Can really connect it anywhere on the block or the body. The area of the engine harness its coming from though I believe that is g109, which is bolted to the driver side shock tower on the inside. It wont show ground when you test it because its a ground supply to other components.
Its #3 in the picture.
Nope, that's not it. That ground wire is attached. Further, it's on the wrong side of the engine bay. This wire is on the side of the harness with the AC compressor and alternator connections.
Ah yep, you right. Picture you gave had me looking on the wrong side. It should be part of g105 then. Front side of the trans, where the main engine cable ground is. Should be a bolt with a stud on top of it for another nut to be attached. #3 #
I'm not in a location where I can look at the car right now. This *might* be it. I see you have some diagram access and would appreciate it if you could look one more time.
I did have a ring terminal on the harness that connected along with the body ground lead in your diagram item #3. The stud on my car is not in the same location as your diagram. My stud was part of the starter mounting hardware. As I said, I'm not at the car right now but I believe that threaded hole on the trans is empty on my car. I'll get a pic the next time I'm home. Point being, I believe I have connected that ring terminal already and correctly. I still yet have the extra one pictured above not connected to anything.
Do you have a diagram of the same harness on the alternator side of the engine bay? That will hopefully show me what I'm looking for. Thanks.
That is the factory location for a 05 with a 2.2. The diagram is for a auto though so if you have a manual it might be somewhere else but it shouldn't be on the starter bolt unless someone moved it at one point for some reason.
I have access to gm service information as a tech. There's no ground terminals shown for the alternator/ac compressor area that I can find.
Pull the tape back on that ring and make sure its a black wire on the terminal. Looks like it is in the pic and if so its just a matter of finding a bolt that size to bolt it to the block honestly.
Sound good, I kept looking through schematics and found g111 in the area your in. No clear image though. This was the best I could find, #8 in the diagram. I circled the boss's that likely it would bolt to in the block image in yellow. Red is the one i believe most likely to be used, check for witness marks if there isn't any bolts there.
Here is my progress. I photographed the connection you referenced in post #4. I circled the location where that grounding post should be on the transmission right next to the plug. As you can see, there is nothing there. Rather, those two grounds are connected to the engine just under the oil filter. I have a pretty good explanation for that. I had my transmission replaced with a built unit long, long ago. The shop that did it probably reconnected those grounds to the block because the grounding post that came off with the original transmission probably never came back with the new one. So, honestly, not a big problem.
Then the second photo is our original mystery wire with the conduit removed. The wire is completely black, not even a stripe from what I can tell. I reconnected the vehicles electrical power and tested it. It has no voltage, and no path to ground on its own. So, at this point, I'm feeling pretty confident that is a ground wire.
Thank you very much for your schematic pictures. I'll investigate those bosses for evidence of attachment. I'm guessing this wire was attached to the AC compressor which is why I can't find a bolt with nothing attached to it.
Yep that a ground wire for either a module, sensors, or some component. It wouldn't be connected to the ac or alternator themselves, should be bolted to the block. Id see if you could bolt it to the block on one of the boss's i showed. Yea that one was moved bc that new location shouldn't be used for that. Its a transmission mounting bolt so it shouldn't have those grounds there.
I'm fairly certain that is the ground for the fan (I think G111). Should go to the boss on the left of the picture just above the ac compressor, I'm dealing with a fan issue with my LNF and it appears I managed to not connect that ground to the boss and actually connected it to the power supply on the starter (that is an entire thread of its own without a conclusion till next weekend)
That should be the spot. I havent had time to go out and look at my ls or ss to check but gm tends to use the same locations for multiple engines when they are in the same family. Makes diagrams universal.
I did find a wiring diagram for the LNF and it was the same one Kolt posted and the ground location is the same for the LNF and L61 for the G111 even with the different fan setups.
I wanted to follow up on this one for those of your that helped me out. First, I've conceded that the wire is just another ground and I attached it. Powered up the car and nothing exploded. So that's good. There is something interesting about the ground attached point on the transmission that Kolt posted. I took some pictures. I removed the intake manifold to get good views. This is the present location of the ground on my car as discussed from post #9.
Engine harness ground location.
Now as we discussed, this should be attached to the bolt hole on the transmission. I investigated that hole and it does appear to threaded. However, the bolt pictured here is a transmission mounting bolt. Here it is:
Transmission mount and grounding bolt
That bolt would be overkill if used in just the transmission itself. It is obviously in the right place, providing mounting for the trans to the engine, and a ground stud. So, I left it alone. We are talking about a ground location here. Electrically, it's all the same. But I'm convinced that my ground is in the right location, and there is a difference between the car and the schematic. I just thought you might all find that interesting.
That is a good mount for that ground, the difference in the diagram to yours is likely the difference in auto/manual trans locations. Also may be due to the diagrams are usually from the 05 cars so any updates to service info rarely get changes bc of course gm is cheap and why pay someone to do that when they can waste the techs time to just figure it out themselves.
That bolt size is pretty appropriate for trans mounting but it does look like it has been changed possibly, gms bolts are usually always flanged, and it also looks a little long. As long as it doesnt bottom out or contact anything on the otherside though it will work good enough.
