Grounds

deadbeat · Nov 23, 2007

Guys, i was reading posts about grounds on the 2.9, i have a 90 ranger and I read about an orange ground wire that goes to the passenger side of the motor. I went and looked at mine, cant find the wire or any wire that is orange that isnt hooked up to anything. The guy who swapped my motor out left the ground off the drivers side head to the wiper motor. The posts say it comes out of the tfi module, but mine has no orange wire. Any information about this ground and what harness it comes out of would be much appreciated.

CopyKat · Nov 23, 2007

There is no Orange ground wire

It's an open braided band. it bolts to the back of the Drivers side head and bolts to the stud at the wiper motor.

The negative post on the battery should have a cable that bolts to the frame,Tee's off, and then bolts to the block on the passenger side.

deadbeat · Nov 23, 2007

MAKG said:
2.9Ls have ONE ground strap to the upper intake. It goes on the driver's side near center. There should be NO other ground straps going there. Both heads have and need grounds. One is a strap (driver's side) and the other is an orange wire coming out of a wiring harness. Leaving either of these out will cause driveability problems.

there is also one on the other side, or that is what it said in a bunch of posts I have read

skippy · Nov 23, 2007

on my 83,the orange wire,ground from pcm lands on the rear of drivers side head on the same bolt that holds the braided strap going up to the fire wall.for 1990 the haynes manual shows this wire to be black.should have an eyelet connector the bolt goes through.mine comes from wire harness going to distributor and goes behind carb to the back of the head.hope this helps.

deadbeat · Nov 23, 2007

the only orange wire I can find on mine goes into the o2 sensor plug, i cant find an eyelet on any wire. I have a problem with the way my truck runs and everyone in other threads have discussed this ground that I cannot find, I had the motor changed once and the guy did a shatty job.

skippy · Nov 23, 2007

all the wiring diagrams in my book show a 2.3,3.0 and 4.0 engine but no 2.9.and the ground is black #20 from pcm.i show a orange wire to o2 sensor w/black/lt.green wire to ground.

deadbeat · Nov 23, 2007

thanks man, youve been a lot of help, i cant find a wire but MakG says there is one there on the 2.9, maybe he can tell me more

AllanD · Nov 23, 2007

I'll actually have to locate the 2.9 harness that's around here (somewhere)
and look.

Tomorrow or sunday.

It's dark now.

AD

deadbeat · Nov 23, 2007

alright man, that would be cool.

deadbeat · Nov 23, 2007

would it serve the same purpose if i just put a ground between the heads?

Natedog · Nov 24, 2007

deadbeat said:
... 2.9, i have a 90 ranger and I read about an orange ground wire that goes to the passenger side of the motor. I went and looked at mine, cant find the wire or any wire that is orange that isnt hooked up to anything. The guy who swapped my motor out left the ground off the drivers side head to the wiper motor. The posts say it comes out of the tfi module, but mine has no orange wire...

That would be a BROWN wire grounding to the passenger side head that comes out of the wiring harness near the TFI module....at least on my 87 4x2. However the 87 4x4 didn't have this wire. Not for sure about your 90.

CopyKat said:
There is no Orange ground wire.

It's an open braided band. it bolts to the back of the Drivers side head and bolts to the stud at the wiper motor.

The negative post on the battery should have a cable that bolts to the frame,Tee's off, and then bolts to the block on the passenger side.

YES.

deadbeat · Nov 24, 2007

so there could be a brown, does it come out of the large harness that goes over the firewall or the small one that the tfi comes out of?

Natedog · Nov 24, 2007

deadbeat said:
so there could be a brown, does it come out of the large harness that goes over the firewall or the small one that the tfi comes out of?

Out of the TFI harness, guess I should have been more specific.

deadbeat · Nov 26, 2007

I looked into mine yesterday. Turns out mine has a black wire with an orange stripe on it. It is the bottom wire out of the TFI module. I found the spot where someone had broke the wire. I added in the ground.

Natedog · Nov 26, 2007

Does it run any different?

Grounds

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