"Part Time" light will not illuminate and other noob questions. - Jeep Wrangler Forum
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Old 01-08-2010, 11:10 AM   #1
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"Part Time" light will not illuminate and other noob questions.

Hi all,

I've put the Jeep in 4WD a few times this winter, with the storm we had last night I finally really got to try it out. The last few times I've put the transmission into the 4H position I've noticed that the 'part time' light does not illuminate. 4WD definitely engages despite the lack of a light. Is this indictive of some sort of problem, or could this just be something simple such as a sensor that is supposed to trigger the light?

When I'm crusing in 4WD I notice a bit more drive line noise, I assume this is normal? It's just more of a 'humming' sound is how I'd describe it.

Also, the manual doesn't explain much regarding 4H vs. 4L. As I understand it, 4L is really only for getting out of an extra slippery spot? I don't believe I'm supposed to cruise in it, correct? Does the L position somehow mechanically lock the wheels or something for the extra traction?

Also, the manual says that 4H can be engaged up to 55MPH... does that mean that 55MPH should be the max cruising speed in 4H even if it's engaged at a lower speed? I'm guessing if I need 4WD I probably shouldn't be going very fast anyway, but just curious.

Lastly, I've read a bit about 'wind up' in regards to using 4WD at the wrong times. I'm a big paranoid about damaging drive line components by having the vehicle in 4WD for too long when driving to work, even if the roads are a bit snowy/wet. Is it safe to use 4WD for wet roads, or should I really just reserve it for more slippery conditions like slush and snow?

Sorry for the numerous questions, but I'd hate to damage something needlessly. Thanks in advance.

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Old 01-17-2010, 11:17 AM   #2
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Join Date: Jan 2010
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If you put your jeep in 4L and drive it you will see what is going on. It is a LOW (very low) gear ratio. I am not sure what the top speed is but it will shift quickly and rev high. Just start off slow and see how low the gears are. Normal use for this would be if you are stuck or if you are going through some real deep stuff and want to avoid getting stuck, or pulling someone out who is stuck. Just be careful if the wheels are spinning because it will rev very quickly.

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Old 01-17-2010, 01:14 PM   #3
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Quote:
Originally Posted by SlowSpyder View Post
Hi all,

Is this indictive of some sort of problem, or could this just be something simple such as a sensor that is supposed to trigger the light?

When I'm crusing in 4WD I notice a bit more drive line noise, I assume this is normal? It's just more of a 'humming' sound is how I'd describe it.



Also, the manual says that 4H can be engaged up to 55MPH... does that mean that 55MPH should be the max cruising speed in 4H even if it's engaged at a lower speed? I'm guessing if I need 4WD I probably shouldn't be going very fast anyway, but just curious.

Lastly, I've read a bit about 'wind up' in regards to using 4WD at the wrong times. I'm a big paranoid about damaging drive line components by having the vehicle in 4WD for too long when driving to work, even if the roads are a bit snowy/wet. Is it safe to use 4WD for wet roads, or should I really just reserve it for more slippery conditions like slush and snow?

Sorry for the numerous questions, but I'd hate to damage something needlessly. Thanks in advance.
You probably have a burned out bulb, resulting in no light.

Humming is normal.

If you can SAFELY drive 55.... You don't need 4WD... You really shouldn't need 4WD for wet pavement. Only if you are slipping, which if you are driving properly for the conditions, you shouldn't be slipping on wet pavement.

If conditions are deteriorated, slow the heck down.
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