Listed here is a good used Volvo ignition switch switch from a recent crash damaged 1993 Volvo 850.  This unit functions properly and comes with a 60 day warranty.  OEM volvo part.  Please see your original part number for fit.

-828140 Is imprinted on this

Typical problems with this switch include
- Loss of return function - unit "sticks" in start position
- Defective contact units, which can cause a whole host of problems including no start, or non functional electrical items.  there are many contacts in this unit, if some don't work, several very strange things can happen electrically when attempting to start.
- failure of the key in ignition indicator

This unit was checked for all of this, and for normal function, it works great!

 List price at VolvoUSA was previously nearly $179! get this one for less than you would pay in tax at the dealer! I only sell the OEM units, never aftermarket so they are the same quality as your original. 

I will offer a 30 day functionality guarantee ,Thanks for looking and good luck!