TM 10-3930-669-34 (11) Install   two   wires   (52   and   53)   on   heater (50) with screw (51). (12) Connect  two  wires  (48  and  49)  on  heater (50). (13) Install  cover  (46)  on  heater  housing  (47) with seven screws (45). (14) Connect  three  wires  (44,  43,  and  42)  on switch (41). (15) Install switch (41) on cab (26). (16) Install  heater  temperature  control  (40)  on cab (26) with four screws (39). 7-39