When the start button from the ECU-5000 unit is pressed, the engine is not starting on battery when kept on 'MANUAL NODE'. There is no alarm on the panel which
can stop its starting. .The battery voltage if 26.5 Volt.
We have also checked the system hydraulically and found to be starting
Later we have checked all the possible relay and found to have continuity.
There is no proper relay name in the manual.

Afterwards we have shorted 54-55 on ECU 5000 TB unit and found that the engine has started. This suggests that the battery,crank motor and other circuit ahead of this unit is working

Please suggest the reason of not starting from panel ECU-5000