Yep, the two Red w/blue wires should show zero ohms when in Park and Neutral, and the two (edit: ) Black w/red wires should show the same when in Reverse only.
You can do somewhat the same with a battery and test lamp if you don't have a volt-ohm meter. But every Bronco owner should have a volt-ohm meter!
If you don't have one yet, this is a good excuse.
Paul