there is a tab on the female terminal that engages the housing you need to depress to get it out.

You can see it in this picture

http://www.rowand.net/Shop/Tech/images/AutomotiveElectricalConnector-Packard56.jpg

a bit of info on how to release them

http://www.rowand.net/Shop/Tech/images/AutomotiveElectricalConnector-ManualPage.jpg


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