For over 30 years, my husband and I have used a Weber Kettle to cook our turkeys. (For those of you who may not know, a Weber Kettle is sort of a round type charcoal grill). We use regular charcoal, put on opposite sides of the grill rack with a drip pan in between. Clean turkey and tie up the wings with a thin wire to keep them close to the body (so not to get burned so much). We baste it about every 30-45 min with butter or margarine spiced with salt, pepper,crushed red pepper, garlic, onion, even some herbs. Just whatever your taste is. It cooks faster usually than in the oven, just follow the directions for the grill, and bring to proper temperature on a meat thermometer, and you will have the juiciest,most flavorful bird you have ever made! We have even cooked the turkey this way when the snow outside was GRILL DEEP-we had to dig it out first. Our neighbors thought we were nuts, until they got a bite of that bird! Oh, and you can make gravy from the drippings for a smokey tasting gravy. Just drain the drippings, and use a small amount (they are VERY rich)and proceed the normal way with your gravy. We have made turkeys all year long this way, no need for a special occasion 
Wonderful Grilled Turkey
From The Hillbilly Housewife: Freezer Cooking Made Simple
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Are you still eating out, ordering pizza or stopping at the Drive-Thru window on your way home to get dinner? Let me show you how simple it is to put delicious, homecooked meals on the dinner table in less time than it takes you to order takeout. It's healthier and a lot less expensive and best of all, it won't take much time at all to prepare these homemade freezer meals. Order your copy of Freezer Cooking Made Simple Today!
This sounds soooo good. Going to have to try it super soon, thanks
How could you do this on a gas grille. It would be interesting because that is what I have at home.