MEP-004a 15kw 400hz Starts, but wont run w/out battle short

[GiftedFaithful]

Unit fires and runs well, even if held for 60 seconds of more, once start is released she dies right out. If battle short is engaged it will run fine for unlimited time. Any ideas or suggestions?

 

[derf]

Maintain battle short.
There is probably a relay bad or sensor somewhere. Whatever the battle short shorts is likely the culprit. Is there not a troubleshooting item in the TM about this?

 

[PeterD]

Just to be a nit-picking jerk, a MEP-004a is not 400 Hz... If it is 400 Hz then it is a MEP-113A.

That bit of lame verbiage over, a couple of things, did you do a light test on the light panel? If yes, do all lights work correctly? If not do so. Once all bulbs are OK, which lights (if any) are on when it is running?