Will a wiring harness for a 1992 Ford Explorer work for a 1991 model?

Will a wiring harness for a 1992 Ford Explorer work for a 1991 model?

If it came from a Explorer with the same engine, it should.That's for the main engine harness that runs to the computer. If its the maf or o2 sensor harness, they have to be matched depending on transmission type.So if you remove the current harness out of your vehicle and it has a automatic transmission, the harness you reinstall must also be for a automatic. You might find more info related to this subject at http://sbftech.com or
http://veryuseful.com
The site shows a bunch of wiring harness diagrams.

It should but you could call a local Ford dealer parts dept and they will look it up in their parts exchange catalog.