recently while riding my 99 500 scrambler in the mud i noticed that only the left front tire was spinning.i took the entire right hub and drive assembly apart and nothing appeared to be broken but i'm not really familiar with the electricy engaged mechanisms scrambers use.i did make sure there was juice getting down to the hub.the test light lit up each time i turned the 4 wheel drive switch on.any help would be greatly appreciated.
thanks

 

Make sure when the hub is engaged that you are getting a magnetic charge to the inside plates. If not then you have a wiring problem, if yes then you may need to try replacing the armature plate, it is only a few dollars and is a wear item. Well, here I found this info. in another forum, I don't think Farmr will mind me reposting it here. Hope this helps.
There is nothing mysterious about the hub. If you are pretty sure that you are getting electrical power to the magnet, I can walk you through it. Check for power, first, though.

If that doesn't work, pop off the hub cover (3 screws) and check the torque on the axle nut. Tighten to 110 INCH pounds. If the cotter pin doesn't line up, gradually tighten until it does, not to exceed 130 inch pounds or so if you can help it. Try it again. The design requires a certain amount of preload on the bearings to work 100%.
If none of this works, we are off to dis-assembly.

Support the front end, and pop the hub cover off. Remove the axle nut, and everything else that follows, paying special attention to how everything went together. To do it right, you will have to remove the wheel, and brake caliper. After getting the guts out, remove the hub itself. Now put your machine in either hi or low, turn the switch on, and engage the 4wd switch. Check to see that the magnet gets magnetic. If not, there is your problem. Either a bad magnet or wire. If it does, check the armature plate. This is the piece that goes between the magnet and the roller cage. If it seems worn, or bent even just a tiny bit, replace it (cost is like $2 or so). Check the 3 little tabs on it carefully. If they look at all bent, replace the plate.
If all looks well, clean everything up good, and re-assemble, being very careful that the 3 tabs in the plate line up exactly with the 3 little notches in the roller cage, or you will bend the plate, and ruin it. Check the key in the axle (the little metal rectangle that fits between the axle and roller cage). If it is broken, or missing, you won't have 4wd.
Re-torque the axle nut to 100 inch pounds, while rotating the hub to 'set' the bearings, then re-torque to 100, and tighten until you can insert the cotter pin. Re-fill the hub and see if it works.

 

I tried all of that and still didnt work.Had to take it to the shop where we putin all new seals,races,and a roller cage.Still didnt work so had to run all the wires and clean the strut where the magnet is.Now it works.Sometimes even the best of us have to take it in to the shop.THe mechanic there bitches every time I take mine in because it aint never a simple job.

 

that same problem happeaned to my brothers and the only problem was the stupidest thing in the world. all it was was a connection that makes the 4wheel drive work. check out the connections