TM 10-3930-669-20 7-19.  TRANSMISSION SPEED SELECTOR/WIPER SWITCH REPLACEMENT (CONT). NOTE Tag and mark diodes and relays prior to removal. (2) Remove   two   diodes   (5)   and   relays   (6) from fuse panel (7). (3) Remove   four   lock   nuts   (8),   screws   (9), and  switch  ID  plate  (10)  from  instrument panel (11).  Discard lock nuts. NOTE Tag and mark all wires prior to removal. (4) Disconnect three wires (12) from transmission speed selector switch (13). (5) Remove  switch  (13)  from  switch  ID  plate (10). b.  Installation. (1) Install switch (13) on switch ID plate (10). (2) Connect three wires (12) on switch (13). (3) Install  switch  ID  plate  (10)  on  instrument panel  (11)  with  four  screws  (9)  and  lock nuts (8). 7-42