MD-3 was a 115VAC Electric only Cart.
MA-1A was a Palouste (High Pressure Air) starter cart...
On the -38A, we used on board battery for start, "Huffer Cart" to spin er up.
Need the air unit...
Good thought though.
Mike
(How do I remember this stuff, and can not remember what I had for breakfast?)
EDIT: My bad...Oops..., Thinking back, MD-3 was 115VAC - and - 28 VDC