1993 Nissan Pathfinder burning through starters

1993 Nissan Pathfinder - approx. 198,000 miles

My problem started this past spring when we heard a loud, high-pitched whirring noise after turning the pathfinder off; then it wouldn't start back up again. The battery had just been replaced, so we knew it was probably the starter.

1st "new" starter was a rebuilt starter and the same thing happened within a week or so. The garage thought it was probably a faulty starter since it was a rebuilt one and they replaced it with a brand new one, not rebuilt. That one lasted about two weeks tops, same thing, electrical, high-pitched whirring noise (starter not disengaging).

We took it back in again, the garage worked on it for a week or so and tried everything, the only only thing they could find that "fixed" the problem was routing electrical around the cruise control. A month later, wouldn't start (we don't drive it very often), but the battery isn't dead.

So, four starters later, I am looking for new answers. It is not just faulty starters. Obviously this problem lies with something else. Solenoid? Flywheel?

The garage we had it at is a little local place, we will take it to the dealer this next time, but I want to know if they are feeding me a line of crap or not.

Please give me some suggestions.