WD-40 is flammable and really isn't good to use on areas where electrical connections are intended. As someone that has worked on high-voltage systems up through 69KV IMHO there are many other solutions to your problem.
In addition to the materials mentioned above designed for electrical aplications if I were you I would ensure the connector pins are properly aligned and clean. For cleaning the inside (assuming it's a sealed connector) CRC makes two great products just for electrical cleaning.
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Ernest Jenkins
2005 Newell Thunder
Shakin the open road!
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