What are these strange things of which you talk??? In..ter...mit...ant wi..per??????
Its a simple switch (called a park switch) that is housed alongside the motor; cost to replace is approx £12. Don't replace the whole motor as if your wipers are still moving its still working. Did mine about two months ago, quick 5minute job, part number is 520160 (for a 1992 defender 90).
Hope that helps,
Chris
Make a note of which wires go where,
Made that mistake,
Also try and get Bearmach not britpart park switch,