Good day, h25 gas turbine goes to full speed no load, however when we do try to excite in avr mode the MD contactor closes and then opens back up and a 703 alarm pops up. The ldcc core is fully booted and the machine doesn't trip. The 41G never closes any help please

This is a ex2000

 

Did you read the manual about this 703 alarm? Maybe there is in the manual what to do when this alarm occurs.
You can also contact the company that supplied you the gas turbine, maybe they can help onsite.