Check the switch, if it has power going to it and the switch is working check the connection at the point were it runs into the tranny or differential. The plug may have come unplugged.
How to Identify and Resolve Common Issues ?
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During turns, a locking differential operates like an open differential – the wheels can rotate at different speeds. However, when traction is needed, the axles can be mechanically locked together forcing the wheels to rotate at the same speed.
There are a few possible causes for the wheel to get locked. The most likely would be low differential fluid, differential side gears, a ring and pinion failure, or a failing limited slip unit. The first thing checked will be the level and condition of the differential fluid.
This can result in the vehicle failing to deliver enough torque to the drive wheels to keep the vehicle moving forward, at which point it will be stuck. The diff lock forces all wheels to spin at the same speed, regardless of traction.
Disadvantages: A locked differential will not allow for wheel speed differences between the right and left wheels. This means additional tyre wear, as well as binding within the drivetrain as a result.
When using the differential lock, your speed should not exceed 25 mph. The Tre locking differential allows the driver to force the vehicle to use all (or both, depending on where the lock is located) tires when cornering.
To Engage (Lock)
Some vehicle manufacturers will allow the differential locks to be engaged while moving but only if the vehicle does not exceed 40kph and there is no wheel spin. Let up momentarily on the accelerator pedal to relieve torque on the gearing and allow the sliding clutch to fully engage.
A locking rear differential, once engaged, does not allow both wheels to spin freely. By ensuring that both wheels spin at the same rate, and applying unequal torque to each tire on the axle, the risk of losing traction or spinning out decreases dramatically.
One possible additional option for 2WD truck owners is an effective locking system for the differential. A number of 2WD and 4WD pickups have limited-slip differentials that lock up the axle when a wheel starts to slip. When the axle is locked, full power is delivered to both wheels.
With this arrangement, a full-time 4WD vehicle is able to operate safely on the road with its center differential unlocked, then traverse loose terrain by locking that differential. While 4WD can split power evenly front-to-rear, it can`t apportion it side-to-side, across an axle.
A vehicle will steer better with only the rear axle locked than it would with only the front axle locked. The advantages of the bonus traction most often far outweigh the disadvantages of understeer, but generally you will usually find no noticeable understeer as a result of only having a rear Air Locker engaged.
Drifting entries don`t typically require an LSD, as slowing the car can be done through brakes, handbrake, or friction. Corner midpoints are harder without LSD, as the unloaded tire will spin, preventing acceleration. But with a locked diff, midcorner and exits are much easier.
Slid it into another car and kiss your insurance goodbye since locked diffs are illegal.
Hearing an increase in the level of humming noises or gear grinding is a way of knowing almost for sure that you have a worn out differential. Usually the humming gets louder under acceleration. When this occurs it`s best to check the condition of your differential and replace if it`s in a rough condition.
Probably the first thing you might notice when a differential isn`t working properly is a loss of handling and control while driving. The vehicle may pull hard to one side or feel “loose” when turning corners. Acceleration may also feel a bit sluggish. These could be signs of wheel alignment problems, as well.
If the vehicle has manually selectable 4WD, then you can get away with this, but it`s obviously not ideal. If the vehicle is not selectable and is instead a full time AWD, then you cannot do this, as the car will put all the power to the front differential because it doesn`t have any resistance.
Shift your transmission into neutral. Turn the transfer control case (the shifter that controls 2WD and 4WD) into its desired position. Put the vehicle back in gear.
Can you switch from 4WD to 2WD while driving? Yes on some systems you can switch happily between them whilst driving. normally 4L you must be stationary to select if unsure refer to manufacturers instructions.
Most four-wheel drive vehicles allow you to switch from 2WD to 4WD while the car is in motion, but only under certain circumstances. Take the following precautions when switching from 2WD to 4WD while moving: Reduce to a slow speed, never exceeding 60 mph. Make the switch while driving in a straight line.
Because power is split evenly, all of the wheels will turn at the same speed. Four-wheel drive vehicles generally have three settings: 2H, 4L, and 4H. 2H is ideal for normal, everyday driving. Use 2H for dry, flat, paved roads. 4L is best suited for a time when you need maximum traction and power.
Traction control is reactive. This is it`s single biggest downfall; you have to physically lose traction for it to kick in. Lockers on the other hand ensure your wheels turn at the same speed, and you don`t have to lose traction for them to kick in. Traction control also inevitably wears your brakes out a little.
But a rear locker is always a handy aid to have, can help ease out of bogged sand situations for example.
Locking Differentials are available in both Automatic and Selectable types. Automatic lockers lock and unlock automatically with no direct input from the driver. This type of locking differential forces both wheels to turn at the same speed when torque is applied.
The easiest to control and drift is the automatic option. However, it`s not all about ease, and if you`re skilful enough, you can make a manual gearbox work very well. Changing gears can unsettle the car and if you have an automatic gearbox, you don`t have control over changing down a gear mid-corner.