TM 10-3930-669-20 7-13.  GLOW PLUG SWITCH REPLACEMENT (CONT). b.  Installation. (1) Install  two  wires  (8)  on  glow  plug  switch (6) and tighten two screws (7). (2) Install glow plug switch (6) in lower cover (3) with nut (5). (3) Install lower cover (3) and upper cover (2) on  steering  column  (4)  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 7-30