Obviously your continuum transfunctioner... 3 steps to fix this very common issue for cars that sit for that long.
1. Pull out your left head light, making sure that you drain all blinker fluid "very important"
2. Behind the left head light should be either an intake box, or a battery.. At this point, its junk, either of those 2 are what's causing the issue, so tear it out and throw it away.
3. Find a live badger, and shove it in your pants for making a thread as retarded as this, and gtfo.