I just replaced both of the relays for my 1998 XJ8 3.2 X308 in the hope that the craziness that I've experienced with the wiper stopping whenever and wherever would stop, but it didn't.
The relays I used are brand new. It's annoying and even so dangerous for the wiper to stop wherever it pleases as sometimes it does in the middle of the windshield and I have to get it running again which implicates a few rounds of it moving and then stopping ***** nilly wherever it pleases. Besides the relay, does anyone has another idea I could try?
Thanks!

 

If the control column switch is the same as the X300 the wires come off the switch or there is wire pinching in the column

 

Thanks! I will check that as well. The other functions of said lever work properly.

 

As far as I remember, its not the lever, but the wiper motor itself.
It has contacts to determine the stop-points, which wear out.
I don't know if it is even repairable, we changed the whole wiper assembly on 2 cars.

 

This information is based on the X300 model which may be different

There is one contact point micro switch under the cover in the motor gearbox that can be replaced

The dimension of the red button depression is critical and they come in different dimensions

Some get the normal open and normal close switches mis - ordered

the motor itself turns through a continuous one direction full rotation after another

Someone replaced a capacitor on the motors electric brushes

 

Thank you very much! That might be helpful! I'm a little hesitant on getting a used one since regardless of the fact there are many good used parts out there, I wouldn't like to test murphy's law on getting the same problem on a different part. However new ones are scarce and quite expensive so I'm going to check if it can be serviced and the contact point replaced.
Cheers!