... glad I could help and the mystery is solved.
Help me identify this wire
Le Mans Master
Joined: Mar 2002
Posts: 5,955
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From: PNW
Looks like a ground wire. There is a grounding lug on the frame located between the battery box and the fuse box (if you're looking straight down on the frame rail). On my 2002 Z06, there are 3 ground wires connected to the lug, and one of those wires looks similar to yours, and it runs over to a larger wire harness that goes into the cabin.
Last edited by ZeeOSix; Jan 31, 2014 at 05:08 PM.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
In my 2001 FSM there are a couple of single lug ground wires (black and white) that are in that area. One goes to G104 (I believe this is the one shown above) and the other to G106 in that same area. I found these by looking in the Volume 2 engine electrical and controls schematics this morning.
The only one that goes back into the passenger compartment is the one going to G104 but it goes to a splice pack S208 that services grounding a number of things like the instrument panel among others.
The other one going to G106 provides grounding for things like the PCM and the MAF.
I am puzzled, but it definitely appears to be a factory ground wire and lug. Unconnected, if it were serving either of these 2 above functions you should have a bunch of problems.
Your only other option is to look in the I/P fuse box area and try to find where it goes. A real PITA.
The only one that goes back into the passenger compartment is the one going to G104 but it goes to a splice pack S208 that services grounding a number of things like the instrument panel among others.
The other one going to G106 provides grounding for things like the PCM and the MAF.
I am puzzled, but it definitely appears to be a factory ground wire and lug. Unconnected, if it were serving either of these 2 above functions you should have a bunch of problems.
Your only other option is to look in the I/P fuse box area and try to find where it goes. A real PITA.
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Looks like a ground wire. There is a grounding lug on the frame located between the battery box and the fuse box (if you're looking straight down on the frame rail). On my 2002 Z06, there are 3 ground wires connected to the lug, and one of those wires looks similar to yours, and it runs over to a larger wire harness that goes into the cabin.
Race Director
Joined: Apr 2007
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From: South Western Ontario
Yup, a ground wire that goes to that stud which is G104. When you see what it grounds it is surprising the car worked as well as they did. All the stuff on SP208 is connected to that wire.
Last edited by lionelhutz; Feb 2, 2014 at 10:10 AM.
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I bought the car with ~ 9k on it and have put another 2k on it myself in about 3-4 months. It hasn't had the slightest problem. Right now my gauge cluster is out because the previous owner had those red gauge ring bezels on the cluster. They are epoxied on so I am looking for a low mileage replacement and trying to find out how I can get the new one flashed w/ my mileage. With that said I haven't yet seen the cluster react to the new ground and I haven't been able to drive it but I feel very confident that ground is in its correct home and was probably forgotten during the fog light retrofit. Is so weird my car acted perfectly fine with that wire disconnected. I am eager to get my hands on a pristine gauge cluster so I can crank her up and take her for a spin.
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Also from the above picture that stud has 1 large gauge wire and 2 small gauge wires. You cannot tell from the above picture but that wire with the large black heatshrink on it near the lug is actually an identical black/white stripe wire that goes directly underneath the engine bay fuse panel. Is the black/white stripe wire that comes from the passenger compartment the one that services SP208?
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Race Director
Joined: Apr 2007
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From: South Western Ontario
That's what my manual says for SP208 - "Instrument panel harness, RH side of instrument panel, grounded to G104 (CKT 851)"
I couldn't find a picture of it but it's saying SP208 is under the dash and it hooks to G104 out beside the battery so that wire has to be ground for it.
I couldn't find a picture of it but it's saying SP208 is under the dash and it hooks to G104 out beside the battery so that wire has to be ground for it.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
I bought the car with ~ 9k on it and have put another 2k on it myself in about 3-4 months. It hasn't had the slightest problem. Right now my gauge cluster is out because the previous owner had those red gauge ring bezels on the cluster. They are epoxied on so I am looking for a low mileage replacement and trying to find out how I can get the new one flashed w/ my mileage. With that said I haven't yet seen the cluster react to the new ground and I haven't been able to drive it but I feel very confident that ground is in its correct home and was probably forgotten during the fog light retrofit. Is so weird my car acted perfectly fine with that wire disconnected. I am eager to get my hands on a pristine gauge cluster so I can crank her up and take her for a spin.
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That would be great if I could avoid a trip to the dealer. I have a line on a one in good condition but mileage unknown. Once I get that taken care of I can button everything back together and go for a ride!
Le Mans Master
Joined: Mar 2011
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From: Columbia SC
Here is the link on transferring the circuit board that stores the mileage. Refer to Post #5 and 11 specifically.
http://forums.corvetteforum.com/c5-t...e-cluster.html
http://forums.corvetteforum.com/c5-t...e-cluster.html
Thread Starter
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Here is the link on transferring the circuit board that stores the mileage. Refer to Post #5 and 11 specifically.
http://forums.corvetteforum.com/c5-t...e-cluster.html
http://forums.corvetteforum.com/c5-t...e-cluster.html
https://www.corvetteforum.com/c5-tec...ansferred.html
Here they say the bigger board houses the mileage. Are they wrong? Thanks again for your time.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
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From: Columbia SC
I heard from chevy409. He confirmed it is the big board in the IPC. He actually did a swap with another IPC and the odometer mileage DID MOVE by just transferring that one board. Given you just want to undo the previous bezel work done, just get another IPC and swap the board. The previous link I provided should provide enough info for the board swap. Good luck. Let us know how it goes.
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So I got the cluster replaced and installed and all is good with the mileage and with the extra ground wire connected. I don't actually don't see a difference but it makes me feel better.
I do have one problem I am hoping I can get some help with. The Speedometer is off by 10 mph. When I am parked (car off or on) it reads 10 mph and when it sweeps when the key is turned to the on position it only goes to about 185-190. Could the needle just be in the wrong place or is their some adjustment? When driving it is a consistent 10 mph off the entire time.
I do have one problem I am hoping I can get some help with. The Speedometer is off by 10 mph. When I am parked (car off or on) it reads 10 mph and when it sweeps when the key is turned to the on position it only goes to about 185-190. Could the needle just be in the wrong place or is their some adjustment? When driving it is a consistent 10 mph off the entire time.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
So I got the cluster replaced and installed and all is good with the mileage and with the extra ground wire connected. I don't actually don't see a difference but it makes me feel better.
I do have one problem I am hoping I can get some help with. The Speedometer is off by 10 mph. When I am parked (car off or on) it reads 10 mph and when it sweeps when the key is turned to the on position it only goes to about 185-190. Could the needle just be in the wrong place or is their some adjustment? When driving it is a consistent 10 mph off the entire time.
I do have one problem I am hoping I can get some help with. The Speedometer is off by 10 mph. When I am parked (car off or on) it reads 10 mph and when it sweeps when the key is turned to the on position it only goes to about 185-190. Could the needle just be in the wrong place or is their some adjustment? When driving it is a consistent 10 mph off the entire time.
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The HUD seems to be right on. It shows 0 when I am stopped (speedo shows 10). If the HUD shows I am going 55 the speedo is reading slightly over 65 maybe 68ish. Didn't have this problem before the swap. I swapped all my old internals to the new cluster. Main board, power supply, and speaker. I did a ton of searching and couldn't really find anyone else with that issue. Can I swap the actual speedo gauge from my old cluster?
Le Mans Master
Joined: Mar 2011
Posts: 6,835
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From: Columbia SC
Yes, you can swap out any of the gauges. Never done it, but the speedo shops do it every day to fix the gauges. Will try and find any info I can.
You might try and see if you can move the needle on the armature to re-zero it. I would guess it is a press fit.
PS: No luck on my searches for the actual gauge removal.
You might try and see if you can move the needle on the armature to re-zero it. I would guess it is a press fit.
PS: No luck on my searches for the actual gauge removal.
Last edited by dadaroo; Feb 8, 2014 at 11:27 AM.