M870/M870A1 semitrailers have both 12-volt and 24-volt receptacles, use the 24-volt
24. Connect free end of inter-vehicular harness cable plug (30) to receptacle (31) on semitrailer.
The M870 and M870A1 semitrailers have different air reservoir configurations (refer to figure
25. Ensure semitrailer air reservoirs (32) have drain cocks (33) in closed position.
M870 - FRONT AND MIDDLE
M870 - REAR RESERVOIR
M870A1 - ALL RESERVOIR
26. With aid of an assistant, disconnect heavy-duty winch cable (14) from semitrailer lifting eye (16) and stow heavy-
duty winch cable (14).