Hey Michael,
This is going to be a process of elimination. I would start with the fuse box. You have an unwanted ground or something going on. Ask him if he has installed anything lately: new sterio? guages? go back and find the ground problem there first if so. Something is crossed up & causing the reverse senario you describe. I wish I had the answer, but you need to find the ground/wiring problem. Get your 12Vt tester out & start checking the problem areas. If you are getting a "click" or blinking, take a look at the flasher (or replace) & wiring around there too.
BTW: I am striking out BIG-TIME on finding you a AR... black guns are sold out & all on waiting lists. Sorry!!