'92 Explorer keyless remote programing?

[poconojoe]

Hi everyone,
My '92 Explorer has a dealer installed Ford "Remote Plus" alarm system. One remote is working fine but I want to replace a lost second remote. I need the programing procedures for the new remote. I have tried the method of turning the key from off to run 5 times and leaving it on run. I've even tried it 6,7,8,9 and 10 times. It doesn't go into the program mode (the locks don't unlock). I seem to remember a service guy reaching under the dash to do something when he programed a remote for me years ago.
Any ideas?
Thanks,
Joe