diode for 7.3
 

Does anyone know how to test diode for the pcm that's located in fuse box under hood? Someone said if there are no clicks the diode is probably bad. But I am having trouble finding one. Anyone know who handles them?

I have a 1994 ford f350 with the 7.3 and cannot get it to start. Found the fuse for pcm blown but nothing when I changed it. Unplugged fuel heater but still no start no smoke or nothing. There is no noise when key is turned on. Thinking it could be bad diode.

Thanks
Alton