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Old 10-05-2009, 08:51 AM
Location: Kansas
3,855 posts, read 11,743,203 times
Reputation: 1714


Buddy of mine just bought a 2002 Chevy Blazer. We were doing some maintainence on it (changing the oil, coolant, tranny fluid) when I was under it I noticed that there was a ground wire just hanging down there. There is the main ground cable coming off the battery and 2 other smaller ground wires. It's one of the smaller ones that is not connected. It was about 3 ft long and probably 16ga and had a loop on the end where it should be bolted to something....the frame....the body....engine block....heck i don't know.

I looked up the wire diagram on Autozone's website (see attached) and it seems to indicate exactly what I'm seeing: 3 grounds coming off the battery. They go to G101, G110, and G106.....well that's all well and good if you know what G101, G110, and G106 actually are. My guess is it's supposed to be for G110 or G106....

little help?

Edit: btw...i just bolted it to the frame so as not to have a ground wire just dangling around. Didn't really think I could screw up by bolting a ground to the frame.
Attached Thumbnails
Disconnected Ground Wire?-wiring-diagram.jpg  

Last edited by drjones96; 10-05-2009 at 09:16 AM..
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Old 10-05-2009, 09:30 AM
6,368 posts, read 13,860,572 times
Reputation: 5881
Try this link. They're basically the same vehicle.

all the ground locations for a 2003 silverado ha... - JustAnswer
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Old 10-05-2009, 10:54 AM
Location: Kansas
3,855 posts, read 11,743,203 times
Reputation: 1714
hmmm....seems like i may have got that right by accident.
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Old 04-11-2015, 06:27 PM
2 posts, read 45,931 times
Reputation: 11
probably too late . 2001 Grand cherokee. starts ,drives but then quits,and won`t start,after a bit,it starts till it quits again, then it goes again ,and on and on. Code 0320 comes up. crank sensor? disconnect battery and reconnect and it would not start. and code was p-0320 again. then still no start so we left it sit.came back reconnect battery and No codes. runs ok,but noticed loose ground strap from engine to firewall.so it tightened up. now no quit issues so far but just idling. It quit before just idling. Now no codes come up and it won`t quit.like before? all because ground to engine or?
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Old 04-12-2015, 10:13 AM
2,600 posts, read 6,037,417 times
Reputation: 2428
Blazer ??

K or S ??

Engine size ??

2 or 4 wd ??
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Old 04-12-2015, 10:46 AM
2,600 posts, read 6,037,417 times
Reputation: 2428
With no clarification as to what you have, I'll give you the general rule.

G110 - automatic transfer case/abs ground.

G106 - auxiliary negative battery ground.

G101 - more info needed because its a main ground that manages many things !
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Old 11-24-2016, 09:20 AM
1 posts, read 26,866 times
Reputation: 11
I would like to know bout all my grounds 03 Silvy 6.0 gas,2500hd,4X4,auto, xcab,
BC I have that REP crap...AND..
My PCM FUSE under hood makes REP come on when I wiggle it or pull out when key is on position
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Old 02-21-2019, 07:03 AM
Location: Mississippi
2 posts, read 4,487 times
Reputation: 10
02 Avalanche 1500 Z71, going down road battery light starts flashing on and off then security light flashes couple times then stays on, meanwhile as this is flashing the fuel and temperature stop working, abs light and airbag light comes on. Can restart truck all disappear except airbag light but can restart all this over again at any time. Please help!! This Has happened more than once
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Old 02-21-2019, 09:52 AM
5,308 posts, read 2,754,696 times
Reputation: 9818
Re: Stray ground wire

ALWAYS check under the vehicle after any shop service that might have entailed disconnecting wires.

I once noticed a ground wire dangling under my truck, too. Luckily for me, there was a place near it on the frame showing where the bit HAD been fastened. I put it back there. The guys who had had to remove the original cargo bed (long and weird story) must not have reconnected everything.

These kinds of omissions make yet another good reason to do some of my own routine servicing.
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Old 02-21-2019, 06:16 PM
Location: Brawndo-Thirst-Mutilator-Nation
16,327 posts, read 16,435,972 times
Reputation: 12357
Those multiple grounds and their positioning are quite important. Ground-points can and sometimes do become disconnected, this may cause circuits that are grounded in that specific grounding section to not work.

Sometimes there is not continuity/good continuity between body-sections without a ground-strap connecting the body-sections.......this will cause a difference in potential between those points and current to flow, bad thing. Battery-ground and chassis-ground should be at nearly the same potential at all points on the vehicle.
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