I thought I saved the info on my computer on how to test the glow plugs and relays of all the Ford Diesel models, but can't find it now.

Anyone know the link to the info?

I have a 1991 F250 and now that it's getting colder the wait to start light comes on and goes right out with no clicking and a smoke plume with a hard start.
I need to fix it before it gets too cold as I have the block heater to get me going in the morning, but when I try to start it after a full 10 hours at work, I will be stuck.