Thanks for all the replies. I am now completely, 100% confused. Here's what I know...
* My shifter has 3 positions: 2WD, 4HI, and 4LO
* When in 4HI or 4LO, the instrument panel reads Part Time.
* The Full Time light never lights up, regardless of which gear I'm in.
What SHOULD happen? When SHOULD the Full Time light come on?
Forgive my ignorance. I'm new to Jeeps in general.
You have a 231 transfer case, also called command track. Your full time light should never come on, because you do not have a full time transfer case.
As already stated, the NP231 transfer case (which you have) is a part-time case, which means you should NEVER use your 4 wheel drive on dry - or even wet roads. Only ice/snow/mud/ slippery stuff like that. If you go wheeling, you can use the 4hi/4lo as needed.
In Jeep terminology, 4 full time means you can use that 4 wheel drive mode all day, anywhere, everywhere. Full time transfer cases have a "center diff" that allows different wheel speeds between front and rear axles. This makes turning easier, and also won't cause the drivetrain to bind.
Part time four wheel drive means the front and rear axles are 100% locked together inside the transfer case, thus not allowing for wheel speed differences between front/rear. On dry surface, this causes a lot of strain on the drivetrain. If you use part time 4wd on ie. dry roads at highway speeds, you might crack the transfer case or damage your axles.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***