Instrument gremlins.

Hmmm, Its gotta be shorting out somewhere.
I gotta admit though electrical gremlin are a beast that is not fun to tackle. Just think they get bigger and badder as the cars get newer.

You stated earlier that when you turned on the driver side blinkers it blinked really fast. That is an indicator of low resistance, there is too much power going into the relay. (For example people who switch to LED bulbs typically have this problem, since LED's have about 80% less resistance than standard incandescent light bulbs)

A dim light with really slow blinking (like one blink every 2 or more seconds) will indicate a very high resistance (or even weak power).

There are just soo many variables, I alway have my trusty multimeter with me when I do electrical work because a lot of times "you just don't know".