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Old 01-08-2011, 05:03 PM   #1
Join Date: Aug 2010
Posts: 35
Any ideas what these are?

Or what they connect to?
Wrangler YJ 88
(Located under my dash, steering wheel area.)
1:Click image for larger version

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2:same connection as 1... just showing wiresClick image for larger version

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3: Click image for larger version

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Old 01-08-2011, 05:06 PM   #2
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Posts: 189
vacuum connections i think..for ur 4WD??....

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Old 01-08-2011, 05:09 PM   #3
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That would explain the 4wd not working....
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Old 01-08-2011, 11:26 PM   #4
Join Date: Aug 2010
Location: Merritt Island, FL - on the Space Coast
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Shouldn't be 4wd vacuum - all of those hoses are in the engine compartment, not under the dash.

I have yet to go into my heater system and get it working again, but from my preliminary reading up on the whole system there is one control that operates off vacuum while all the rest are cable operated(can't remember which one at the moment). The hard vacuum lines in the picture may be part of that. There is enough stuff on mine that has been bypassed, altered, or removed that I haven't come across that exact fitting yet - but I'm still exploring and finding things to reconnect properly.
Mark J
Merritt Island, FL

When a person asks you for advice, they don't want advice. They want corroboration
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Old 01-09-2011, 09:55 AM   #5
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Posts: 35
Heater isn't working either... (the list gets longer and longer... ) But, I think the black and green tubes are part of the heating system. Does anyone know what the little "button" on the third picture does? Should it be hooked to something?

How about the first picture? Anyone have any ideas? This wire/connection is just hanging down behind the heater control unit.
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Old 01-09-2011, 10:28 AM   #6
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the #3 does look like the vacuum line cluster that 's mounted on the heater control unit.

two green wires should go on the switch on the left and a coupling has to be there for the switch on the right (blower motor speed control). I'll check the rest today
95 YJ Rio Grande 2.5L 5-speed (We're at point "A". Where is point "B"? Who gives a sh..!? )
02 Triumph Sprint RS 955i (speed junky)
04 Honda Odyssey EX (parent-mobile)
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Old 01-11-2011, 10:14 AM   #7
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That's exactly where picture #3 goes... great. I get to pull out the whole heater control unit and see if I can reconnect. It looks like it controls the heat, defrost, vent...

Still wondering what the top picture connects to... Any help or anyone have a guess? Seriously, a guess would be closer to where I am now... I have searched under the dash for a place to connect it... but can't find anything.
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Old 02-13-2011, 02:02 AM   #8
Join Date: Feb 2011
Posts: 14
#1 my guess is to the factory ac option. what are the wire colors? I just pulled out that whole harness (started with what does this plug go to?).
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Old 02-13-2011, 03:17 AM   #9
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Location: Loveland, CO
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There are a lot of wires that were put in case that option was ever installed. You will even find wire to the non-existent AC unit under the hood.

The Closest I have found to it so far is for the Rear window defogger. But the colors I have list are incorrect from what you have there. The other one that looks close would be the Emmision Maintenance timer, which most of us disconnected at one time to get the light to go off on the dash. Gonna take a look at mine.
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Old 02-13-2011, 03:27 AM   #10
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Location: Loveland, CO
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On my 89 that isn't the Emission timer either. The one you have is bigger.

I'm basing my defogger guess on the Wiring diagrams for 87-90 they show a plug similar to that, but no scale. They list the wires as BR, BR/WT, BL. Also according to this the other half of that would be above the parking brake handle.

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