1-5-3-6-2-4
This means that the spark plugs fire in that order, starting with cylinder #1.
Here's a quick visual representation:
* Bank 1 (Driver's side): 1-3-5
* Bank 2 (Passenger side): 2-4-6
Keep in mind that this is a general firing order for the 2.8L V6 in the 1985 Ford Ranger. It's always best to consult your specific vehicle's owner's manual or a reliable repair manual for confirmation.