I just bought an 85' supra and i cant figure out how to turn off the alarm ( i believe its stock) any ideas?

Yes. Pull the fuse to it. It does have it's own fuse underneath your dash. A friend of mine had the same issue on a 1985 Nissan 300ZX. It kept draining his battery. He went to five different mechanics and none of them figured this out. I think it's because they didn't know that those cars (like your Supra) came standard with a theft deterrent system. Anyway, I pulled out the fuse for him and he never had a problem with it again.