Datsun B210 wiring connectors

Just bought an ITC B210. I cannot figure out how to take the wiring harness connectors apart. The part doesnot show a break or slot in the connector (rear tail light harness). The shop manual is no help either. I know, this should not be rocket science but I am stumped.

Thanks for you input.

What year B210? Can you post a picture of the connector? I'm a Z guy but the connectors are probably the same.

Chuck

It is a 1976. Unforunately, I do not have photo capability right now.