Extruder motor won't drive while printing

I have a LDM printer setup with a Rambo 1.3 board running Marlin firmware and Repetier host. I essentially built and setup the printer from the bones of an older, obsolete printer and I have everything setup except the extruder motor will not drive while printing. The printer does not have a hot end or heated bed, and I think somewhere in the firmware or settings there is an error not allowing it to print due to the thermal settings, but that is just my best guess. I can run the extruder manually using the manual control in Repetier, so I know everything is connected at least.

So far I have:

Used a resistor connected to the thermistor to fool the printer into thinking the 'hot end' is at 189.4 C (hoping to fool it into thinking it is PLA)

Tried seemingly every combination of thermal settings to bypass bypass the heated bed and hot end checks.

It does run the retract and extra length on restart settings while trying to print. It just doesn't run the extruder motor while it is executing a print job

Thank you,

-Nick