4WD light stays on

[browntrout]

Hi there Folks,

I recently had my BJ74 in 4wd and when I was finished using it I pushed the electronic diff button to the off position and unlocked the hubs and continued driving. When I got home I noticed the 4wd light was still on so I repeated taking the BJ in and out of 4wd drive but the light still remains on.

Anyone have similar problems? Any ideas of what it may be, fuse etc?

Thanks all

Spencer

 

[Haggs]

I had a similar problem a couple of weeks ago but the 4wd wouldn't engage(-25 celsius). There must have been something frozen because when the temperatures warmed up (-5 celsius) it engaged and disengaged no problem.

 

[Ron R]

Spencer,
Possibilty is it's only the switch.
This switch is on the transfer and activated by the mechanical stuff inside. So it can be possible that the Transfer still is engaged,but it can be stuck by itself (frozen?). However you unlocked the hubs so there is no immediate risk of damaging the drivetrain.
Should the transfer still be engaged in 4wd don't continue driving this way.
You can easily check or the transfer is still engaged by grabbing the front drive-shaft. If you can turn it by hand (both hubs unlocked!) it's not engaged and it probably is just a stuck switch.
If you cannot turn it by hand, it's still engaged. If then you want or have to drive your rig, engage ONE of the two front hubs. This way there will be no binding in the drivetrain and there will be no excessive strain on the frontdiff.
If it's still engaged, check the vacuum lines that run to and from the solenoids.


Have fun

 

[WojtekSz]

Ron
i cannot understand why just ONE hub should be engaged.
If the transfer is engeged then the ring in the differrential is rotating and both axle shafts are rotating. When the hubs are open this should not have any significant influence on the front wheels especially that the wheels will be practically rotating (more or less) at the same speed (providing there are no significant rear wheels spinning on snow/ice).
If just one hub is engeged we would get some additional diff movements - why? Does it help in lubrification?
regards

 

[crushers]

check by turning the front driveshaft by hand. if it rotates then it is the switch OR one hub not disengageing.
if you think it is one hub then jack up the front and turn the wheel... if one turns easier than the other then the hub is locked.