Any ideas, 07 Apex starts up and cuts out quickly

[MUSTANG1]

I have 700 miles on an 07 Apex. I've started the sled once a month and ran for about 15 minutes. This past weekend, the sled would start up for about 2 seconds and shut off. Tried this 3x and quit. Any ideas?? Battery tender jr. has been used off and on to keep a charge. Would a weak battery do this, I thought once the sled fired up it would keep running. Never had this issue with my 03 carbed after 8,000 miles. Any insight would be appreciated. I took the headlight unit off so I couldn't see if there were any codes firing.

 

[Srxspec]

Put in new spark plugs and I bet it fires right up.

 

[Handy]

I don't think it will run without the instrument cluster hooked up.

 

[Srxspec]

It will run and idle fine without the instrument cluster.

 

[attakred06]

ok. guys there is a connector along the main harnest under the left side of the deltabox the white one is a ground junction look if there is a dark spot on it

 

[attakred06]

ok. guys there is a connector along the main harnest under the left side of the deltabox the white one is a ground junction look if there is a dark spot on it