An electrical connector comprising: a housing including a front housing and a rear housing separately provided from and matable to the front housing to define the housing; the front housing having front terminal channels configured to receive terminals, the front housing having front keying features for aligning the front housing with the rear housing for mating thereto; the rear housing having rear terminal channels aligned with the front terminal channels when the rear housing is mated with the front housing, the rear housing having rear keying features that interact with the front keying features to align the front housing with the rear housing during mating; and an independent secondary lock device coupled to the housing, the independent secondary lock device having a front plate positioned in front of the front housing with front plate channels therethrough configured to be aligned with the front terminal channels, the independent secondary lock device having a lock plate positioned between the front housing and the rear housing with lock plate channels therethrough, the independent secondary lock device having a staged mating sequence with the housing, wherein in a first stage, the lock plate channels are aligned with the front and rear terminal channels to allow the terminals to at least partially pass therethrough from the rear terminal channels into the front terminal channels during loading of the terminals into the housing, and wherein in a second stage, the lock plate is moved relative to the housing to a blocking position where the lock plate blocks the terminals from removal from the front terminal channels, wherein the front terminal channels have shoulders proximate to a front of the front housing, the shoulders configured to block forward movement of the terminals in the front terminal channels. a housing including a front housing and a rear housing separately provided from and matable to the front housing to define the housing; the front housing having front terminal channels configured to receive terminals, the front housing having front keying features for aligning the front housing with the rear housing for mating thereto; the rear housing having rear terminal channels aligned with the front terminal channels when the rear housing is mated with the front housing, the rear housing having rear keying features that interact with the front keying features to align the front housing with the rear housing during mating; and an independent secondary lock device coupled to the housing, the independent secondary lock device having a front plate positioned in front of the front housing with front plate channels therethrough configured to be aligned with the front terminal channels, the independent secondary lock device having a lock plate positioned between the front housing and the rear housing with lock plate channels therethrough, the independent secondary lock device having a staged mating sequence with the housing, wherein in a first stage, the lock plate channels are aligned with the front and rear terminal channels to allow the terminals to at least partially pass therethrough from the rear terminal channels into the front terminal channels during loading of the terminals into the housing, and wherein in a second stage, the lock plate is moved relative to the housing to a blocking position where the lock plate blocks the terminals from removal from the front terminal channels, wherein the front terminal channels have shoulders proximate to a front of the front housing, the shoulders configured to block forward movement of the terminals in the front terminal channels.