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General Forums => The Mess Hall => Topic started by: czjeeper on April 20, 2010, 10:00:45 PM

Title: Under dash wiring changes?
Post by: czjeeper on April 20, 2010, 10:00:45 PM: I've got a '92 YJ.
The under dash harness is thrashed from the PO.
I bought a totally mint, uncut harness from Ebay.
It was advertised as a 92-95 harness.
It has the hardtop plugs for the wiper, and defrost. Not sure if that places it for age or not.
Anyway, I installed it and everything worked but it wouldn't turn over. The accessory, and run positions both worked, but the starter never kicked over.
Anybody know anything about the years of harness changes?
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 20, 2010, 10:47:54 PM: Did you reseat the plugs? Especially the ones on the column? I would suspect that the wiring is the same. Maybe there is a minor change in pinout? There is really no way to tell what the harness is actually from unless you can match the color of the individual wires to a FSM.
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 20, 2010, 10:51:43 PM: Yeah, everything was inserted good.
Many of the wire colors were totally different on the plugs.
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 20, 2010, 11:11:51 PM: Quote from: czjeeper on April 20, 2010, 10:51:43 PM
Yeah, everything was inserted good.
Many of the wire colors were totally different on the plugs.
Well, list the colors of the harness for the ignition. I can look up '91, '92, '94 and '95.
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 11:54:50 AM: I was under the impression that the 92-95 harness was the same?
Here are the plugs that go into the steering column wiring.
My original 92

(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1917.jpg)

The "new harness"

(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1918.jpg)
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 12:00:48 PM: And here are the plugs for the ignition switch.

(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1920.jpg)
Title: Re: Under dash wiring changes?
Post by: aw12345 on April 21, 2010, 01:17:32 PM: Trace the wire that gets hot in the start position at the ignition switch and follow it in the connectors to the bulkhead plug. Match it with the wiring diagram. If all else works then just reworking the wire for the starter solenoid should be an easy fix
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 21, 2010, 01:21:03 PM: The harness is at least a '94-'95 Could be '93 but it's not a '91 or a '92. The pin-outs are the same for the steering column, indicator plug though.

The 18YL on the blue plug is for the starter. The 12RD is your main power from the Power distribution.

I would probably trace the starter wire to make sure it's not open.
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 01:56:43 PM: So, technically, this harness should work?
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 21, 2010, 02:02:07 PM: Quote from: czjeeper on April 21, 2010, 01:56:43 PM
So, technically, this harness should work?
I believe it should.
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 02:19:32 PM: Quote from: Jeffy on April 21, 2010, 01:21:03 PM
The harness is at least a '94-'95 Could be '93 but it's not a '91 or a '92. The pin-outs are the same for the steering column, indicator plug though.

The 18YL on the blue plug is for the starter. The 12RD is your main power from the Power distribution.

I would probably trace the starter wire to make sure it's not open.

I traced the yellow wire on the new harness, and it is good from ignition plug to PDC plug.
On MY harness the ignition plug wire routes over the steering wheel to the drivers side.
So it looks like this wire gets power from the fuse box instead of the PDC plug in the middle of the firewall...
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 21, 2010, 02:27:46 PM: Quote from: czjeeper on April 21, 2010, 02:19:32 PM
I traced the yellow wire on the new harness, and it is good from plug to plug.
On MY harness, the wiring on the blue ignition plug and the PDC plug are not the same.
So they're not in the same locations? You can always take apart the plug and relocate the wire to the correct port.
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 02:31:41 PM: Quote from: Jeffy on April 21, 2010, 02:27:46 PM
So they're not in the same locations? You can always take apart the plug and relocate the wire to the correct port.

Sorry, I clarified my last post.
I guess my '92 is getting power for the ignition switch from the drivers side fuse box?
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 21, 2010, 03:24:37 PM: 14VT goes to the fuse box #7 and controls the turn signals and wiper.
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 03:41:26 PM: Okay, is the yellow wire on this plug here the 18YL you talked aobut earlier?
(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1920.jpg)

it goes to the yellow wire on this plug
(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1921.jpg)

On my '92 harness the wire in the same location is Green
(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1922.jpg)

But doesn't go to this plug (PDC, center of firewall)
(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1923.jpg)
(http://i19.photobucket.com/albums/b183/c_zielsdorf/Car%20Pics/Jeep%20Wrangler/IMG_1924.jpg)

Or am I totally screwed up and looking for the wrong wire?
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 21, 2010, 04:39:34 PM: OK when looking at Schematics wires are listed as Gauge and Color. So that yellow wire on the blue plug is a 14 gauge Yellow wire. On your '92 it's 14GN or 14 gauge Green.

From the schematics it looks like that 14GN turns into a 16GN which goes to a relay. The relay is what connects the starter to the power distribution center. 12RD should head to the PDC while a 14GN/WT (14 gauge green with white stripe.) goes to the starter.

Here are the schematics:

(http://i4.photobucket.com/albums/y118/yokomura/4BangerJP/manuals/YJ-7.jpg)(http://i4.photobucket.com/albums/y118/yokomura/4BangerJP/manuals/YJ-9.jpg)
Title: Re: Under dash wiring changes?
Post by: czjeeper on April 21, 2010, 06:01:20 PM: Thanks for all the help.
I'm kinda lost on what to do though.
I don't know what to do to make it work.
Title: Re: Under dash wiring changes?
Post by: Jeffy on April 21, 2010, 06:08:10 PM: Well, make sure everything is wired properly (pin-outs match etc...) then make sure there is connectivity with a VOM. Double check that starter relay as well. You can always reuse your old harness for that part and see if it starts. If it does then you know it's something with the new harness.
Title: Re: Under dash wiring changes?
Post by: Handsomefloyd on November 05, 2012, 05:38:11 PM: I am having the exact same problem. Was there ever resolution to this?
Title: Re: Under dash wiring changes?
Post by: czjeeper on November 05, 2012, 07:25:27 PM: Wow, that was some time ago.
I ended up repairing my original harness.
The '94 and newer routes the wires a bit differently if I remember correctly.
Title: Re: Under dash wiring changes?
Post by: sharpxmen on November 05, 2012, 08:16:05 PM: yeah, 91 thru 95 had 2 different harnesses but functionally they're the same with very minor differences.