That must be an oldie and maybe not a goodie! Todd long gone AFAIK.
https://www.google.ca/search?source=univ&tbm=isch&q=Todd+Engineering+45+amp+Power+Source+45B&sa=X&ved=2ahUKEwjpt52dnsDxAhULjq0KHbDvBagQjJkEegQIFRAC&biw=1041&bih=499#imgrc=CiZSbj82smjUFMThe four wires might be two pair of one with green/white and the other red/white (white is negative in both cases, if so) The Todd takes a red and white in its output terminals.
Basic test is to take the red and white wires out of the Todd and plug in the 120v cord. Now check the red/white terminals for 12v with your meter.
Meanwhile, see if you have any lick using your battery for 12v. Should be battery wires to a 12v fuse panel to run the lights, pump, fans etc.
Lots of choices for replacing the Todd deck mount