I think I replace everthing but GP harness.. 8 new beru gp..new relay-controller,,chassis to engine connector good and clean,,, and no lite for gp comes on plus tryed manual gp switch white wire to swicth and 1 ground to switch it clicks but no start out of ideals 7.3 diesel cdv

 

Look at top for how build a glow plug harness. It worked for me. Easy and cheap

 

top were thanks

 

The top of the forum in the sticky threads for glow plug problems.