View Full Version : Explorer ground question
12-03-2007, 01:44 PM
I have a quick question regarding one of the grounds on my donor vehicle, a 1994 Explorer. I am hoping someone that owns one may be able to help out. On the negative battery terminal there is a black ground wire running off the battery post. The ground has a plug at the end of it. I believe there are two pins or pin connectors inside of it. Could someone tell me what this hooks to or what it grounds? I didn't mark it when I pulled the engine and don't see any stray connectors hanging so I am unsure what it was for. :dntknw:
12-03-2007, 10:08 PM
It should ground the the frame or engine. AFAIK at least...
12-04-2007, 02:26 AM
that is the main EEC ground.
If you disconnect it your truck simply won't start, run or respond to any diagnostic proceedure.
There should be a mating connector on your 4.0 engine management harness that runs along the passenger side inner fender.
I think you found your problem
12-05-2007, 09:34 AM
O.k., at least I might be getting somewhere now. So the ground is supposed to mate somewhere along the harness? I do not see any connectors hanging anywhere near it but I will look again tonight. The connector isn't very long so it can't be too far away.
12-05-2007, 01:05 PM
On my '94 Ranger this 2-pin connector is between the battery and the underhood fuse/relay box. It is visible with the battery removed.
12-05-2007, 03:02 PM
In the 1993 Explorer EVTM that connector is C110.
The Black/White wire feeds ground to
(splice) S105 (75mm from takeoff for battery ground) and thus to:
Pins #6, #40, #60 on the PCM
Via C114 to the PCM power relay
Via C108 to the Ignition Control Module
Via C111 to the Mass Air Flow sensor
Via Splice S137 (Near takeoff for fuel injector #3) to:
C169 and HEGO #1 (Right bank)
C182 and HEGO #2 (left bank)
C183 and the Cylinder Identification Sensor (aka "cam synchronizer" (CALI-ONLY)
so with those two wires not feeding ground to where it belongs...
basically the entire management system is D-E-A-D.
12-06-2007, 08:59 AM
Well last night I found the culprit. The plug had been cut off the harness so that is why I never saw it to begin with. I did find the wires that run to the plug and after some extensive digging I came up with the plug itself. I didn't have time to actually hook it up and try to start it as I had prior engagements but will do so tonight for sure. I do have one other question while I am at it though.
One of my O2 sensor plugs on the main harness got damaged and is unusable so I cut it off at the time being. I plan on getting a new plug and splicing it back to the existing wires. Will this effect the way it runs? I have one of them hooked up (the 94 Explorer has two) but the other is just unplugged at the time. I found a place online that sells plugs for almost any harness but can't remember if I need the one with the pins or without.
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