Hi cwadex
After you add the coordinates for JA Google Map plugin, you need to generate new code and update for the contact module:
You can try this code:
{jamap mode='normal' locations='{"location":{"0":"Avalon, Georgia"},"latitude":{"0":"34.500997996"},"longitude":{"0":"-83.18999924"},"info":{"0":""}}' zoom='8' }{/jamap}