Electrical stuff

[dubie]

I dug the 72 out today and took it over to the shop so I can work on it. I brought it out of winter storage for a couple weeks for a Christmas parade. I knew when I put it away that it had a key off drain somewhere. Where is the first place to look for this? I have a feeling I may have the alternator hooked up wrong. When I put my signal light on, to turn into the shop driveway, the truck died on me, so there is a definate power loss . I had to boost it just to get er going because there was absolutely no power at the key what so ever. I am going back to work on it tonight and see if I can find the drain, but can you guys maybe give me an idea on where to be looking first?

Also. if the engine doesn't have a ground strap on it, would this cause a drain??