YES A generator will work as a DC Motor, BOTH are basically the same thing.
However, a genny produces its output between its ARM post and its case/frame. Assuming theres some residual magnetism in its iron field poles if you spin it the output voltage is measured from ARM post to case NOT from ARM to FLD post as you tried. The faster it turns and the more magnetic field strength present in its field poles THE GREATER THE OUTPUT.
If youre going to use it at Pos ground (or either ground for that matter), having no idea what was done at the shop, I STRONGLY SUGGEST YOU POLARIZE IT BEFORE START UP.
Heres how to peform the Motor Test
MOTOR TEST. You can Motor test the Gen. If its grounded and you remove the belt and apply hot battery voltage direct to its ARM Post and have the Field Post dead grounded to frame, it should motor n run well (Armature n Brushes and Commutator likely okay). Then, if you next remove the Fields ground and it speeds up some, the Fields probably good. If it passes both those tests, it should charge, and if not, it may be a wiring or battery or grounding problem. The hot battery voltage may be taken off the VR's BAT terminal or the starter post or the battery itself for this test.
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