I have a 7.3 put in all new glow plugs and checked all wireing and still won't start unless pluged in

I have a 7.3 and done all I can think of it won't start unless it is pluged in I put all ne glow plugs and wiring still needs to be pluged in and put on new fuel pump

Ohm out your glow plugs through the harness, to ensure the new plugs are working properly:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281

Truck will not start if it is not pluged in and all glowplugs are working made sure they work
.iam thinking I have to check fuel injectors but not sure how to test in the truck any help on this Thanks Ken