Simplex 734-078 — wiring harness connecting a 4100ES or 4100U Transponder Interface Card to legacy 4100 power and communication circuits.
When a 4100U or 4100ES controller is fitted into existing 4100 legacy equipment, the newer Transponder Interface Card does not mate directly with the older power and communication wiring. This pre-terminated harness is the factory service part that bridges that one interface.
- Simplex 4100ES Service Parts List 579-1006 Rev. A: Harness, 4100ES TIC to Legacy Pwr/Comm
- Simplex 4100U Service Parts List 579-330 Rev. A: 4100U TIC to Legacy Pwr/Comm. Harness
- TIC is the Transponder Interface Card, spelled out in both parts lists
- Carries both power and communication across the TIC to legacy interface
- For 4100U and 4100ES controllers retrofitted into 4100 legacy equipment
The 734 block is where mis-picks happen: 734-076 is Harness, Audio Box to Box (4100-0637) and 734-075 Power/Comm Box to Box (4100-0636), 734-084 and 734-087 the Legacy to PDI Pwr/Comm bay-to-bay and box-to-box harnesses, 734-008 the PDI Pwr/Comm harness.
