Grounding locations?
Grounding locations? A few months ago my car got the entire front end rebuilt thanks to a drunk female running into it at 3 am... Since then i cant keep fog lights or turn signals in it longer than about 2-3 weeks... I assume its a ground because i shocked the **** out of myself touching my frame while changing the foglight bulb... Can anyone point out to me all of the common grounding locations on my car?
Joined: Nov 2003
Posts: 11,328
Likes: 345
From: Jacksonville, FL (originally from Toronto Canada)
Here are the common grounds at the front of the car:
G100 (V8) On the lower right side of the engine, above the starter solenoid
G101 In the engine compartment, attached to the front of the left wheelhouse
G102 In the engine compartment, attached to the front of the right wheelhouse
G105 Attached to the top right side of the radiator support
G106 Attached to the top left side of the radiator support
* (G105 and G106 are the grounds for the front lighting - DRL, T/S, headlights)
G109 Attached to the left front frame rail, forward of the brake pressure modulator valve bracket
G110 (V8) Attached to the rear of the left cylinder head
G111 (V8) Attached to the lower left side of the engine, behind the generator
G112 Attached to the rear of the left cylinder head
G100 (V8) On the lower right side of the engine, above the starter solenoid
G101 In the engine compartment, attached to the front of the left wheelhouse
G102 In the engine compartment, attached to the front of the right wheelhouse
G105 Attached to the top right side of the radiator support
G106 Attached to the top left side of the radiator support
* (G105 and G106 are the grounds for the front lighting - DRL, T/S, headlights)
G109 Attached to the left front frame rail, forward of the brake pressure modulator valve bracket
G110 (V8) Attached to the rear of the left cylinder head
G111 (V8) Attached to the lower left side of the engine, behind the generator
G112 Attached to the rear of the left cylinder head
I know I am bringing back a thread from the dead but...
does anyone have pictures of G109 and G111 installed on the car? I think that I may be messing these two.
Also, in G109, what is the brake pressure modulator valve bracket?
Thank you in advance for your help.
JD
does anyone have pictures of G109 and G111 installed on the car? I think that I may be messing these two.
Also, in G109, what is the brake pressure modulator valve bracket?
Thank you in advance for your help.
JD
Joined: Nov 2003
Posts: 11,328
Likes: 345
From: Jacksonville, FL (originally from Toronto Canada)
The brake pressure modulator valve is part of the antilock brake system. It is mounted on the left frame rail:
G109 is a bolt in the left frame rail just in front of the bracket that holds the brake pressure modulator valve:
G111 is a bolt that goes into the engine block on the left side just behind the alternator:
G109 is a bolt in the left frame rail just in front of the bracket that holds the brake pressure modulator valve:
G111 is a bolt that goes into the engine block on the left side just behind the alternator:
from the pictures, it looks like g111 and g109 mount to the same spot on the frame rail. is that true?
do you where g109 comes from? is it a piece of the harness? im not sure if i have this one, ill check shortly.
i for sure dont have a g111, where would be a good place to get one from, the ones at autozone/o'reilly's don't really look like they would get the job done.
do you where g109 comes from? is it a piece of the harness? im not sure if i have this one, ill check shortly.
i for sure dont have a g111, where would be a good place to get one from, the ones at autozone/o'reilly's don't really look like they would get the job done.
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Joined: Nov 2003
Posts: 11,328
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From: Jacksonville, FL (originally from Toronto Canada)
No, G109 is on the frame rail, G111 is on the engine block. Unless you (or someone) has done MAJOR work such as an engine replacement, you have both of them. They're not the kind of thing you can casually remove.
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Verdad Gallardo the engine has been out of this car on multiple occasions. first, by someone else, then by me, because i had to redo what that someone else said that they were going to do.
i understand that g111 is a ground that goes from the engine to the chassis.
-do you know where i can get one of these ground straps?
-do you know where the ground strap attaches to the chassis?
From your second picture that you posted (thank you for posting that), inside of the red circle, it looks like g111 is on the left and g109 is on the right. it also looks like they are both attached to the body at the same place.
-do you know if that is g111 on the left and g109 on the right?
-do you know if g111 and g109 are attached to the chassis at the same place?
-do you know if g109 is part of the harness or just a lone wire?
-if it is just a lone wire, do you know where its other mounting point is?
Thank you!
JD
i understand that g111 is a ground that goes from the engine to the chassis.
-do you know where i can get one of these ground straps?
-do you know where the ground strap attaches to the chassis?
From your second picture that you posted (thank you for posting that), inside of the red circle, it looks like g111 is on the left and g109 is on the right. it also looks like they are both attached to the body at the same place.
-do you know if that is g111 on the left and g109 on the right?
-do you know if g111 and g109 are attached to the chassis at the same place?
-do you know if g109 is part of the harness or just a lone wire?
-if it is just a lone wire, do you know where its other mounting point is?
Thank you!
JD
Joined: Nov 2003
Posts: 11,328
Likes: 345
From: Jacksonville, FL (originally from Toronto Canada)
A little clarification is in order here. Ground points (Gxxx) refer to the point on the body, engine or frame that ground(s) attach to and not to a specific circuit or wire. In other words, G109 is the bolt that goes into the frame rail and G111 is the bolt that goes into the engine block. Any ground point can (and often does) have multiple wires and circuits using it. For example, G200 under the left side of the dash has at least eight circuits and three wires going to it.
So, your impression that G109 and G111 are the same thing is not possible. However, the two ground points are connected to each other by a 4-gauge braided ground strap. The other wire grounding at G109 is for the cruise control module.
If you want the original ground strap, I suspect the dealer is the only place to get it. But you can easily make your own with the right length and gauge of wire or braided strap.
So, your impression that G109 and G111 are the same thing is not possible. However, the two ground points are connected to each other by a 4-gauge braided ground strap. The other wire grounding at G109 is for the cruise control module.
If you want the original ground strap, I suspect the dealer is the only place to get it. But you can easily make your own with the right length and gauge of wire or braided strap.
oh ok, i didnt know that gxxx was referring to a bolt. i thought it was referring to the ground strap itself in the case of G111.
so are you saying that this 4 gauge braided grounding strap is connected to the block using bolt g111 and connected to the chassis in front of the ABS module using bolt g109? if so, my life just got a little bit easier. i kind of doubt that you are saying that though.
i looked yesterday and found that g109 (the bolt) is still there but the wire has been cut. do you know where that wire originates from? (fyi, my cruise control works, just thought i should throw that out there)
g111 (the bolt) is not there either, meaning that the strap is absent as well.
so are you saying that this 4 gauge braided grounding strap is connected to the block using bolt g111 and connected to the chassis in front of the ABS module using bolt g109? if so, my life just got a little bit easier. i kind of doubt that you are saying that though.
i looked yesterday and found that g109 (the bolt) is still there but the wire has been cut. do you know where that wire originates from? (fyi, my cruise control works, just thought i should throw that out there)
g111 (the bolt) is not there either, meaning that the strap is absent as well.
Joined: Nov 2003
Posts: 11,328
Likes: 345
From: Jacksonville, FL (originally from Toronto Canada)
oh ok, i didnt know that gxxx was referring to a bolt. i thought it was referring to the ground strap itself in the case of G111.
so are you saying that this 4 gauge braided grounding strap is connected to the block using bolt g111 and connected to the chassis in front of the ABS module using bolt g109? if so, my life just got a little bit easier. i kind of doubt that you are saying that though.
so are you saying that this 4 gauge braided grounding strap is connected to the block using bolt g111 and connected to the chassis in front of the ABS module using bolt g109? if so, my life just got a little bit easier. i kind of doubt that you are saying that though.
i looked yesterday and found that g109 (the bolt) is still there but the wire has been cut. do you know where that wire originates from? (fyi, my cruise control works, just thought i should throw that out there)
g111 (the bolt) is not there either, meaning that the strap is absent as well.
g111 (the bolt) is not there either, meaning that the strap is absent as well.
this 4 gauge braided wire grounding strap is part of the big 3 that people talk about, correct? if so, i think i might put a bigger gauge wire there. hopefully it helps with my volts dropping in heat and traffic.
Last edited by jdoyle; Jun 26, 2010 at 07:32 PM.
on the engine block to chassis ground on the driver side, could i sandwich the ring terminal between the frame rail and the abs bracket using the abs bracket bolt and get the grounding effect that i am looking for?
or would this be a bad ground or something?
i ask because i dont really think i know very much about electrical systems and grounds.
or would this be a bad ground or something?
i ask because i dont really think i know very much about electrical systems and grounds.
On The Tree
Joined: Jun 2008
Posts: 144
Likes: 1
If you're ever grounding a stereo, any place on the frame with all paint removed, self tapping sheet metal screws, a properly crimped or soldered ring terminal and some star washers is all you need. I prefer the area right by the fastener to hold in the factory scissor jack is on the frame, IIRC, and is ideal. I just thought I'd post it up in case anybody found this thread looking for that info.