Here's one to try to figure out. My 1969 Coronet's tail lights don't work at all. The brake, turn signal and reverse lights work, just not the tail lights or license plate lamp. I checked all the fuses and they're OK. I took a test lamp to the fuse box and all were hot with ignition and lights on, however, after removing a tail bulb from the socket with the blinker and lights on, only the blinker side of the 1157 bulb socket activated the test lamp, not the tail light side. That circuit is not getting power. This car has been restored and most of the wiring harness is new or mint condition. Funny thing is that it worked several weeks ago. Any clues? No night cruises until I get this fixed. I've only had the car a month, I'm ready to hit the streets when she's legal again. Thanks guys!