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Old 09-08-2012, 06:17 PM   #1
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4x4 light on after lift 89 yj

Gf father just did a 2.5 re lift on his 89. He also added the shackles from the 4 Inch lift. He gained quite a bit of height over the flat springs he had before. Also added the drop transfer case and runs smooth.

Now the 4x4 light is on all time. I am a tj guy and don't understand the reasoning behind all of the vacuum lines and what not. I have searched all over and have yet to find a solid answer as to what is going on.

Any insight would be great!

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Old 09-08-2012, 10:38 PM   #2
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Look in the stickies at the top for a thread called yj common issues. There is a link in there to a thread about your problem that should help a bunch.

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Old 09-09-2012, 05:00 PM   #3
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The way these systems are set up it could be alot of things, but the first thing I would check is the 4WD light switch. On an 89 it's located on the firewall next to the battery and has a single wire with a vac. hose on the bottom. The easiest way to check the switch is have the ignition "on". Remove the vac. line that's attached. Place another vac. line on it that's longer. There should be no light at this point since there is no vacuum going to it. The easiest way to check it is to have someone sit in the Jeep and then manually apply vacuum through the line you attached. If the light goes off and on by this method your switch is good. If not, you have a bad switch. If the switch is working properly then you can move to another area that can be discussed once you rule that out.
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Old 09-09-2012, 09:40 PM   #4
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Quote:
Originally Posted by vballspen
Gf father just did a 2.5 re lift on his 89. He also added the shackles from the 4 Inch lift. He gained quite a bit of height over the flat springs he had before. Also added the drop transfer case and runs smooth.

Now the 4x4 light is on all time. I am a tj guy and don't understand the reasoning behind all of the vacuum lines and what not. I have searched all over and have yet to find a solid answer as to what is going on.

Any insight would be great!
Check to see if the vacuum lines for the 4x4 actuator were installed backwards. It could have gotten placed on backwards at the transfer case or the front axle.
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Old 09-10-2012, 07:27 PM   #5
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Switch on top of t case went bad. Thanks for the help
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