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Thanks for all the responses. It is a large site that runs on Wordpress. For the login and registration pages we are currently forcing https. It currently shows the https pages in SERPS for login and registration. Just want to be sure that if I redirect the entire website to https that it wouldn't hurt my rankings.

Can you visit this tool and tell me what result you get from your answers? I'll be able to help more once I know what strategy is best for you. http://www.katemorris.com/issg/

Thanks for your response! Much appreciated