Since I no longer have my FCV (thanks to weeks101) I have wanted to find a plug for the connector that is left open. I found one here: http://www.automotive-connectors.com/5w9t-14a594-aa-4-way-sealed-male-cover-1-5-mm-1-row-coding-i-neutral.html (They are based out of Germany)
This will keep dust/dirt, oil, corrosion of terminals out of the connector. I received mine today and installed it.
