Check 4wd light on

is this the simple PART TIME 4WD system
or is it the optional (day 1choice) TOD system
"torque on demand", we cant guess this, it must be stated.
if its PT, then you are driving it wrong.
PT only works on ICE and dirt.
not dry pavement ever.
stop doing that and stop damaging it.
if not sure post a photo of shifter and dash lights , in 4wd.

shift stopped, or at 1/2 mph, never fast on PT.
save the dogs. and win.
what transmission auto or stick we cant guess that either.
we cant guess optional drivelines EVER>.

but nobody ever does, so you are par for course.

stop
put trans (main in neutral) now shift tranfer case to 2H
that works?
or is 4wd a knob on console not a lever to transfer case.
if i could see whats there, id not have to guess.
see>?

Hi, On most modern 4WD there is lever which you shift in to 4H 4L 2H and N and on others there is a button to switch in to 4WD. Check to which one you have. You should also see a green or red indicator light showing up on your dash when you are in 4WD. Good luck.

1. • 1 Start your Dodge truck's engine.
     
   • 2 Turn the electronic transfer case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" to "4H." The electronic transfer case is located on the instrument panel and is marked with "2WD," "4WD Lock" and 4WD Low." The lever-equipped transfer case is located to the right of your leg and is marked with "2H," "4H" and "4L."
     
   • 3 Shift the transmission into "Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph to begin engaging in the low range 4WD. Turn the electronic transfer case to "4WD Low," if the Dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" or "4H" to "4L."
     
   Tips & Warnings
   • Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
     
   • Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
     
   • Many Dodge trucks allow you to shift from 2-wheel drive to the high range of 4WD at up to 55 mph--consult your truck's manual to ensure that this is possible. Do not exceed 55 mph while engaged in the high range of 4WD. Do not exceed 25 mph while engaged in the low range of 4WD.
     
   • Do not engage in 4WD unless you are on slipper or rocky roads.
     

Transfer Case - Mechanical Shift On The Fly (MSOF) Operation The mechanical shift on the fly (MSOF) system is a manual shift 4WD system that allows the operator to chose between two different 4x4 modes as well as 2-wheel drive. The operator can switch between 2WD and 4H mode at speeds up to 88 km/h (55 mph). To engage or disengage 4L range, the vehicle speed must be less than 5 km/h (3 mph), the brake pedal depressed, and the transmission must be in NEUTRAL.
Shifts between 2H and 4H can be made at a stop or any forward speed up to 88 km/h (55 mph). At temperatures below 0°C (32°F) shifts should not be performed above 72 km/h (45 mph).
The transfer case is equipped with an electromagnetic cluch which is located inside the case. This clutch is used to spin up the front driveline when shifting from 2WD to 4x4 mode at speed. When the manual shift lever is moved, this activates the 4WD indicator switch, 4WD electric clutch relay, and the electromagnetic clutch. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the mainshaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.

I would advise you to check your fuses in the block under the hood and on the driver's side of your dash. If that doesn't fix your problem, you probably need a new transfer case selector motor. A quality aftermarket replacement can be purchased for around $250, and is fairly easy to change. Hope this helps!

This might sound like a silly question but did you put the truck in neutral before you shifted into 4L ? Reason being transfer case damage can occure if it wasnt in neutral when you shifted into 4L.

OK,
It could be that the device that shifts your drive line in and out of 4WD...is sticking, binding or not deactivating for some reason. I am not sure what type of device is used on your vehicle. Jeep uses a sliding splined collar on a 2 piece axle that used to be activated by vacuum motor on the front axle. GM uses an electric plunger motor to achieve the same result. I suggest you find whatever device it is that engages your 4WD....and start there. Good luck. It is always fun to learn something new...and fix it. Chip

I would first check the wires on the transfer case for possible damage at the 2wd/4wd switch.

Check the super select solenoids. I had the same problem with my pajero/montero io, when I released 4WD from 4H to 2H the two front wheels lights started flashing. They stopped flashing and was solid on when I re-engaged the 4WD (2H to 4H).

My problem was a failure in the 2H solenoid, it was not producing enough vacuum. The problem was intermitent at the begining and then was permanent.

I checked the solenoids in this way:
1) The solenoid that receives the vacuum in the botton is for 2H
2) The solenoid that receives the vacuum in the top is for 4H
3) Both solenoids operate in the same way, they only change in the way they transfering vacuum from top/botton to the exit pipe (2H or 4H). The difference is that one has the vacuum input on the top and the another one in the botton.
4) The default position when you disconnect the electronics is 4WD
5) Try disconnecting the electronics and switching the output pipe between the solenoids. This will put the solenoids on 4WD position and you changed the pipes, so the 4WD should disengage.

4WD should disengage if your 4H solenoid is OK, the ligths should now flash when you change from 2H to 4H because 4WD cannot engage because the pipes are switched. You can also check the vacuum of each solenoid with your finger on each one.

If this doesn't work, try to bypass the solenoids and connect the input vacuum hose to the 2H output pipe. If the lights doesn't turn off in 2H mode it's posible that you have different problem.

Also check this address: http://4wd.blogeasy.com/article.view.run?articleID=318776

Good luck.