The harness comes apart into sections at the back of the fuse panel.
You undo the center bolt and the section plugs come out. One will be
for the engine harness, one for the front clip light harness inside the
engine bay. The other harness pieces come off inside at the same time.
Again one piece for the dash and one piece for the body and it's lights.

Places like painless wiring sell kits: http://www.painlesswiring.com/

They only list up to the 86 CJ wiring, but the underhood harness for an
86 CJ7 is 'really' close to the under hood wiring of a 1990 YJ with the
258 in it.

Other places sell them also.

You might want to get a Haynes CJ manual also. It's wiring diagrams are
right on for the later CJ's and I have used it to rewire a couple YJ's
after fires caused by shorts also. The YJ book is crap for the 258 or
4.2 engine bay setup.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

NewbieJeepGuy wrote:
>
> Well I've got my 4wd Posi-Lok installed and seems to work decent but
> will not know more for awhile since I've got other projects to go
> through before going onto some good offroad trips. One thing I've
> noticed while working on my jeep in the engine compartment is that when
> I touch certain wires my buzzer inside the jeep goes off and its
> corresponding with the seat belt light.... and sometimes I can even
> turn my stereo system on...
>
> I know that the wiring is probably hosed because there are a lot of cut
> wires that I have no clue where they would have gone or what they are
> for on the firewall and I'm looking for some suggestions. If I decide
> to replace the wiring harness (which seems to be a good idea), other
> than being a pain in the butt is it something a Newbie can do? Are
> there complete kits out there that I could purchase with great
> instructions to follow on where this wire goes and all that good stuff
> specifically made for my Jeep? I've got the 4.2l 258 Engine and
> looking for some ideas. Hopefully not breaking to many pennies out of
> my piggy bank but have seen they can be spendy...
>
> Thanks again to all in advance.

 

The harness comes apart into sections at the back of the fuse panel.
You undo the center bolt and the section plugs come out. One will be
for the engine harness, one for the front clip light harness inside the
engine bay. The other harness pieces come off inside at the same time.
Again one piece for the dash and one piece for the body and it's lights.

Places like painless wiring sell kits: http://www.painlesswiring.com/

They only list up to the 86 CJ wiring, but the underhood harness for an
86 CJ7 is 'really' close to the under hood wiring of a 1990 YJ with the
258 in it.

Other places sell them also.

You might want to get a Haynes CJ manual also. It's wiring diagrams are
right on for the later CJ's and I have used it to rewire a couple YJ's
after fires caused by shorts also. The YJ book is crap for the 258 or
4.2 engine bay setup.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

NewbieJeepGuy wrote:
>
> Well I've got my 4wd Posi-Lok installed and seems to work decent but
> will not know more for awhile since I've got other projects to go
> through before going onto some good offroad trips. One thing I've
> noticed while working on my jeep in the engine compartment is that when
> I touch certain wires my buzzer inside the jeep goes off and its
> corresponding with the seat belt light.... and sometimes I can even
> turn my stereo system on...
>
> I know that the wiring is probably hosed because there are a lot of cut
> wires that I have no clue where they would have gone or what they are
> for on the firewall and I'm looking for some suggestions. If I decide
> to replace the wiring harness (which seems to be a good idea), other
> than being a pain in the butt is it something a Newbie can do? Are
> there complete kits out there that I could purchase with great
> instructions to follow on where this wire goes and all that good stuff
> specifically made for my Jeep? I've got the 4.2l 258 Engine and
> looking for some ideas. Hopefully not breaking to many pennies out of
> my piggy bank but have seen they can be spendy...
>
> Thanks again to all in advance.

 

The harness comes apart into sections at the back of the fuse panel.
You undo the center bolt and the section plugs come out. One will be
for the engine harness, one for the front clip light harness inside the
engine bay. The other harness pieces come off inside at the same time.
Again one piece for the dash and one piece for the body and it's lights.

Places like painless wiring sell kits: http://www.painlesswiring.com/

They only list up to the 86 CJ wiring, but the underhood harness for an
86 CJ7 is 'really' close to the under hood wiring of a 1990 YJ with the
258 in it.

Other places sell them also.

You might want to get a Haynes CJ manual also. It's wiring diagrams are
right on for the later CJ's and I have used it to rewire a couple YJ's
after fires caused by shorts also. The YJ book is crap for the 258 or
4.2 engine bay setup.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

NewbieJeepGuy wrote:
>
> Well I've got my 4wd Posi-Lok installed and seems to work decent but
> will not know more for awhile since I've got other projects to go
> through before going onto some good offroad trips. One thing I've
> noticed while working on my jeep in the engine compartment is that when
> I touch certain wires my buzzer inside the jeep goes off and its
> corresponding with the seat belt light.... and sometimes I can even
> turn my stereo system on...
>
> I know that the wiring is probably hosed because there are a lot of cut
> wires that I have no clue where they would have gone or what they are
> for on the firewall and I'm looking for some suggestions. If I decide
> to replace the wiring harness (which seems to be a good idea), other
> than being a pain in the butt is it something a Newbie can do? Are
> there complete kits out there that I could purchase with great
> instructions to follow on where this wire goes and all that good stuff
> specifically made for my Jeep? I've got the 4.2l 258 Engine and
> looking for some ideas. Hopefully not breaking to many pennies out of
> my piggy bank but have seen they can be spendy...
>
> Thanks again to all in advance.

 

Mike,

Thanks again for the input. I've noticed the yj info isn't the
greatest and will look into the cj stuff if its close and will work.
I'm hoping to find some wiring harnesses for the yj from someone or a
junkyard instead of having to purchase a full new one or ones. If I
understand correctly there is the main wiring harness, the light
harness and the radio/dash harness. Is that correct or am I missing
one?

Thanks again and I am sorry to sound stupid.

 

Mike,

Thanks again for the input. I've noticed the yj info isn't the
greatest and will look into the cj stuff if its close and will work.
I'm hoping to find some wiring harnesses for the yj from someone or a
junkyard instead of having to purchase a full new one or ones. If I
understand correctly there is the main wiring harness, the light
harness and the radio/dash harness. Is that correct or am I missing
one?

Thanks again and I am sorry to sound stupid.

 

Mike,

Thanks again for the input. I've noticed the yj info isn't the
greatest and will look into the cj stuff if its close and will work.
I'm hoping to find some wiring harnesses for the yj from someone or a
junkyard instead of having to purchase a full new one or ones. If I
understand correctly there is the main wiring harness, the light
harness and the radio/dash harness. Is that correct or am I missing
one?

Thanks again and I am sorry to sound stupid.

 

The body tub has it's own harness chunk, same as the engine.

The CJ book is the best one for the pre 91 YJ's because they are close
to the CJ design. After that, DC started messing with them.

The wiring under the hood is almost identical except some of the
pollution crap and that depends on where the Jeep was sold.

Mike

NewbieJeepGuy wrote:
>
> Mike,
>
> Thanks again for the input. I've noticed the yj info isn't the
> greatest and will look into the cj stuff if its close and will work.
> I'm hoping to find some wiring harnesses for the yj from someone or a
> junkyard instead of having to purchase a full new one or ones. If I
> understand correctly there is the main wiring harness, the light
> harness and the radio/dash harness. Is that correct or am I missing
> one?
>
> Thanks again and I am sorry to sound stupid.

 

The body tub has it's own harness chunk, same as the engine.

The CJ book is the best one for the pre 91 YJ's because they are close
to the CJ design. After that, DC started messing with them.

The wiring under the hood is almost identical except some of the
pollution crap and that depends on where the Jeep was sold.

Mike

NewbieJeepGuy wrote:
>
> Mike,
>
> Thanks again for the input. I've noticed the yj info isn't the
> greatest and will look into the cj stuff if its close and will work.
> I'm hoping to find some wiring harnesses for the yj from someone or a
> junkyard instead of having to purchase a full new one or ones. If I
> understand correctly there is the main wiring harness, the light
> harness and the radio/dash harness. Is that correct or am I missing
> one?
>
> Thanks again and I am sorry to sound stupid.

 

The body tub has it's own harness chunk, same as the engine.

The CJ book is the best one for the pre 91 YJ's because they are close
to the CJ design. After that, DC started messing with them.

The wiring under the hood is almost identical except some of the
pollution crap and that depends on where the Jeep was sold.

Mike

NewbieJeepGuy wrote:
>
> Mike,
>
> Thanks again for the input. I've noticed the yj info isn't the
> greatest and will look into the cj stuff if its close and will work.
> I'm hoping to find some wiring harnesses for the yj from someone or a
> junkyard instead of having to purchase a full new one or ones. If I
> understand correctly there is the main wiring harness, the light
> harness and the radio/dash harness. Is that correct or am I missing
> one?
>
> Thanks again and I am sorry to sound stupid.