Welcome to SteelSoldiers.
Make sure you visit the CUCV FAQ Article (CUCV Wiki) that is at the top of the page on the CUCV Forum. All of the CUCV Technical Manuals are listed and many other helpful bits of information. Download the manuals for reference. Also the wiring diagrams are in the appendix.
Also checkout the FAQ Thread for CUCV's stickey. It is where we try to post helpful tips and tricks.
Almost every question you will have has been asked and answered many times. The advanced search will become your best friend. Please don't hesitate to ask something that you can't find.
Read the TM 9-2320-289-10 Operators Manual to find out how a stock system should work. It is simular to the Operators Manual for Civilian vehicles. It tells you where all the lighs, switches, etc are located and what they do.
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The TM 9-2320-289-20 tech manual has a troubleshooting guide that covers the glowplug system (and almost every system). Read it, read it again and then test your system.
Post your results and we can point you in the right direction
Warthog