I ordered a universal set of sequential tail light flashers for my project car, a 66 Mustang. They came with a very simple installation instructions, I followed to the letter starting on the passenger side tail light. Turned the ign on and flipped the blinker on and the sequential worked, however the driver side tail light also started blinking normally. That was wieid, so I hopped in the car to shut the blinker off and my dash lights were blinking too.

I hate electrical, I just don't get it. It's all the devil's magic.

Anyone here good with this sort of thing? This is just nothing but a headache for me.