TM 10-3930-669-20 7-12.  CAB HEATER BLOWER SWITCH REPLACEMENT (CONT). b.  Installation. (1) Connect three wires (5) to switch (4). (2) Install switch (4) in cab (3). (3) Install  heater  temperature  control  (2)  on cab (3) with four screws (1). NOTE Follow-on Maintenance: Close  cab  door  (TM  10-3930-669- 10). Connect batteries (Para 7-48). Remove    wheel    chocks    (TM    10- 3930-669-10). END OF TASK 7-28

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