The gray glass-filled SPS housing carries a Terminal Position Lock (TPA) feature — a secondary retainer that locks each crimped female socket into its cavity after insertion, preventing terminal back-out under vibration.
What the TPA Latch Means for a Field Repair
The TPA (Terminal Position Lock) is a plastic insert that slides into the housing after all contacts are loaded. It bridges across the terminal retention lances, so a pulled wire cannot push the lance inward and release the contact. On a repair job, this means you seat the crimped terminals first, then slide the TPA home — and the connection stays locked even on a machine that vibrates all shift.
The housing accepts standard H-DAC 64 crimp terminals, which are inserted into the 20 cavities after crimping.