Retrieve Diagnostic Codes 2000 Ranger

Trying to discover how to retrieve diagnostic codes for 2000 Ford Ranger EXT without scan tool (using multi-meter). Under dash plug? How do I connect the meter to read the codes.

I purchased an actron scanner from pepboys for around $95.00 - It works great - However the ranger station has some info that you amy be able to adapt - It is for OBD-I, so I dont know if it will work for your obd-ii vehicle.
http://www.therangerstation.com/OBD_I.html