I have a 97 Ranger extended cab XLT.  My turn signal switch was
intermittant in the right turn position and has now stopped working
all together.  It still works for the left turn position.  Could this
be a burned out turn signal bulb, or is it probably the switch?  Is
there some way to clean the switch contacts, or does the switch
normally need replacing?  If it needs replacing, how difficult is it
to replace?  Recall that the turn signal stalk also houses the wiper/
washer switch mechanism.

I should also mention that it has been really cold where I live.  Not
sure if that might effect the turn signal mechanism.

Thanks for your help.