I recently took my truck into a shop to get the instrument cluster fixed and when I got it back I noticed my 4wd light was on. I figured they just messed up some of the wiring, but when I got it home I noticed that it never turned off and I’m no longer sure what it’s in. When I shift it while sitting in neutral I can only get it to go into three positions. Idk why that is since this is my first 4x4 truck. It’s an automatic 1993, and any info helps, I’m very worried I’ve been running it in 4L or 4H.

The shifter is all the way back right now, which I’m assuming is 4H because it had no issue going 70mph+ today. I honestly can’t tell about hearing the front axle, especially since I’ve never moved the **** until I noticed the light actually working today (granted I’ve only driven it about ~50 miles total since I bought it). I do have locking hubs and they are in the unlocked position currently. The thing is that I can only get it to shift all the way back and to the next two gearings which must be 4L and N, unless it’s set up like the second gens where 2H is the second from furthest back.

It goes
2 wheel drive(normal)
4 wheel drive high (which is pretty much the only 4wd you use unless you wanna go less than 25mph)
neutral
4 wheel drive low (for crazy hard pulling)
ive never had a legitimate reason to use this one. But it’s handy if you need it.

2wd
4wdhigh
neutral
4low

you need to lock your guns if you want to use the 4wheel drive?”, but you should be running in 2wd (farthest forward) to protect your drivetrain for when you need it.
Turn a sharp left your right and you’ll feel the truck binding and struggling to turn,because 4wd is not built forsharp turns. That will tell you what gear your in. 2wd will turn like a normal car.

So the mechanic put it in 4H before he gave it back to me, luckily I only drove around town yesterday with the exception of about 4 miles of highway. It is geared like the second gens, so it goes:
4L
N
2H
4H
Had my buddy come over after work and watch the front driveshaft while I let it roll through the different settings. Thanks for all the help!!